You can sew in extensions yourself, but the back of your head is the hardest part to reach and see
A sew-in (also called a weave) involves braiding your natural hair into cornrows, then stitching wefted hair onto those braids with needle and thread. You can do this on yourself, but most people find it difficult to braid and stitch the back sections without help. The front and sides are manageable; the crown and lower back are where mistakes happen — loose stitches, uneven tension, or braids that pull too tight in spots you cannot see clearly.
If you decide to do it yourself, you will need a hand mirror, a wall mirror, or ideally both positioned so you can see the back of your head. The actual sewing is straightforward once the braids are in place. The real challenge is creating even, find cornrows that will hold the weight of the hair without breaking your natural hair or causing pain.
Key Takeaways
- Sewing in extensions yourself requires braiding your own hair into cornrows, which is difficult to do evenly on the back of your head without a second person or mirror setup.
- You will need a curved needle, thread that matches your hair color, wefted hair bundles, and clips or bobby pins to hold sections while you work.
- Braids that are too tight cause tension alopecia (hair loss from pulling); braids that are too loose will not hold the wefted hair securely.
- The sewing itself takes two to four hours depending on how many rows you install and how familiar you are with the stitch.
- If you make mistakes on the back sections, they are visible to others and difficult to fix without removing and re-braiding.
What you need to buy or gather
Start with wefted hair bundles — these are rows of hair sewn together at the top, designed to be stitched onto braids. Buy bundles that match your hair texture and color, or as close as you can find. Most people use two to four bundles depending on how much coverage they want. Bundles range from 10 to 24 inches in length and cost between $20 and $100 each depending on quality and whether the hair is human or synthetic.
You will also need a curved needle (size 18 or 20), thread in a color that matches your hair, scissors, bobby pins or clips to section your hair while you work, and two mirrors — one wall-mounted and one handheld. A rat-tail comb helps separate sections cleanly. Some people use edge control or gel to keep flyaways down while braiding, though this is optional.
If you have never done cornrows before, practice on a friend or a mannequin head first. The braid tension is the hardest skill to learn, and mistakes here show up when ready when you try to stitch.
How to braid your hair into cornrows
Divide your head into sections using the rat-tail comb. Most people do four to six rows depending on how much hair they have and how much coverage they want. Start at the front hairline and work back. Each row should be roughly the same width — about half an inch to three-quarters of an inch — so the wefted hair sits evenly.
Cornrow by taking three strands of hair and crossing them over each other while adding new hair from the scalp as you go down. The braid should sit flat against your head and feel snug but not painful. If your scalp hurts while you are braiding, you are pulling too tight; loosen it slightly. If the braid feels loose or wobbly, tighten the next section.
Braid all the way to the ends of your hair and find each braid with a small elastic or bobby pin. The braids should be smooth, even in thickness, and lie flat. Uneven braids will cause the wefted hair to sit unevenly, and you will see the gaps.
The back of your head is where most people struggle. Use your handheld mirror to check your work as you go. If you cannot see a section clearly, stop and reposition your mirrors or ask someone to help you braid that row. A crooked or uneven braid in the back is visible to anyone standing behind you.
The sewing process step by step
Thread your curved needle and tie a knot at the end. Start at the front of your head with the first wefted bundle. Position the weft (the sewn top edge of the bundle) against the base of your first cornrow, close to your scalp. Push the needle through the weft and through the braid, then back through the weft, creating a loop stitch. Pull snug but not so tight that you distort the braid.
Continue this stitch along the entire length of the weft, spacing stitches about a quarter-inch apart. When you reach the end of the weft, tie off the thread and start a new piece of thread for the next row. Do not try to sew multiple rows with one long thread; if one stitch breaks, the whole row can come loose.
Work from front to back. The front rows are easier to see and control, so start there and build confidence before moving to the back. Check your work in the mirror frequently. If a stitch feels loose, go back and tighten it before moving on.
The entire process usually takes two to four hours. Do not rush. Loose stitches will cause the hair to slip and shift within days, and you will have to remove and re-sew sections.
Common mistakes and how to avoid them
The most common mistake is braiding too tightly. Tight braids feel find while you are working, but they pull on your natural hair and can cause tension alopecia — permanent hair loss along your hairline and scalp. Braid snugly enough that the weft will not slip, but loose enough that you could fit a pencil under the braid. If your scalp hurts the next day, the braids are too tight and you should take them out and redo them.
The second mistake is spacing stitches too far apart. If your stitches are more than half an inch apart, the weft will sag between stitches and the hair will shift. Stitch every quarter-inch to half-inch for security.
The third mistake is sewing the back rows without being able to see them clearly. If you cannot see what you are doing, you will create uneven stitches, miss spots, or sew at an angle that makes the hair sit crooked. Use mirrors, ask for help, or consider having a professional do the back rows while you do the front.
A fourth mistake is using thread that does not match your hair color. If your thread is visible, it looks unfinished and cheap. Spend a few dollars on thread that blends with your hair.
How long sew-ins last and when to take them out
A sew-in typically lasts four to eight weeks depending on how fast your natural hair grows and how well you maintain it. As your hair grows, the braids move away from your scalp and the wefted hair shifts with them. Eventually the stitches loosen and the hair starts to slip.
You should take out a sew-in before the stitches fail completely, because waiting too long means the braids have moved so far from your scalp that removing the wefted hair also removes chunks of your natural hair. Most people remove and reinstall every six to eight weeks.
To remove a sew-in, carefully cut the thread holding each weft and slide the wefted hair off the braids. Then unbraid your natural hair gently, starting from the bottom and working up. Use a leave-in conditioner while unbraiding to reduce breakage. Your natural hair will be fragile after weeks in braids, so be patient and gentle.
When to ask for professional help
If you have never braided before, or if you cannot see the back of your head clearly even with mirrors, consider having a professional braid your hair and then sew in the extensions yourself. This splits the cost and lets you learn the sewing part on sections you can actually see.
Alternatively, have a professional do the entire installation the first time. Watch and take notes. Many stylists will let you observe and ask questions, and the cost of one professional install ($150 to $400 depending on location and hair quality) is worth it if it saves you from damaging your natural hair with a poorly done first attempt.
If you do try it yourself and realize halfway through that you cannot see or reach a section, stop. Take out what you have done so far and either ask for help or start over. Pushing through when you cannot see what you are doing leads to mistakes that are hard to fix.
Frequently Asked Questions
Can I reuse the wefted hair if I take out my sew-in?
Yes, if you remove the thread carefully and do not damage the weft. Cut the thread close to the weft rather than pulling it out, and inspect the weft for tears before reinstalling. Human hair bundles can be reused three to five times if you care for them. Synthetic hair is more fragile and usually lasts one to two uses.
What if my braids are uneven and the wefted hair sits crooked?
You will need to remove the wefted hair, unbraid, and redo the braids. There is no way to straighten crooked wefted hair once it is sewn in. This is why getting the braids right before sewing is so important. If the back braids are uneven, consider asking someone to help you redo just those rows.
How do I keep my sew-in clean?
Wash your sew-in every one to two weeks with sulfate-free shampoo and cool water. Wet the hair gently, explore shampoo to the braids and wefted hair, rinse thoroughly, and condition the wefted hair (not the braids). Avoid hot water, which can loosen stitches. Let it air-dry or use a low-heat blow dryer.
Will sewing in extensions damage my natural hair?
Sew-ins can damage your hair if the braids are too tight, if you leave them in too long, or if you remove them roughly. Tight braids cause tension alopecia. Leaving them in past eight weeks causes the braids to move so far from your scalp that removing them pulls out natural hair. Gentle removal and loose braiding minimize damage.
How much does it cost to do a sew-in yourself versus going to a stylist?
A DIY sew-in costs $40 to $200 for hair bundles plus the cost of supplies (needle, thread, mirrors) if you do not already have them. A professional installation costs $150 to $400 for labor plus the cost of hair. You save money doing it yourself, but you risk damaging your hair if you make mistakes. Many people find the professional cost worth the safety and time saved.