Start by scalping the head, if there is hair. Once the hair is gone, remove as many of the roots from the holes as possible. The end product should be completely bald and with no stubble.
Molded Hair
Start with a bald male head or a crewcut figure. Ken doesn't lend himself to this treatment as he tends to have wavy hair.
Optional step:Carefully file off the top edge of hair, don't go too deep with the file, or you will open his skull.
Smooth the edges. If the molded hair is flat, or the end style is big, Elvis hair for example, this step is not required.
Cut a piece of First Aid gauze, cheesecloth needle point canvas, or nylon stocking toe that is large enough to wrap around the head covering the top of his head, back of the neck and ears. If using First Aid gauze, wrap several layers. 
The basic technique is simple. Lay a thin line of glue down on the cap, and , press the ends of hair firmly into the glue. Use just enough glue to hold the hair in place. Extra glue will cause strange head bumps .Resist the temptation to use lots of hair. The wig will look more natural if the hair is a bit on the thin side. Barbies have far too much hair, and consequently, the hair is hard to shape into natural looking styles.For the basic parted in the middle, straight with bangs, style:
Run the first line of glue around the outside of the wig cap, and add the hair, so the hair hangs straight down off the cap. Trim or pull the hair away leaving the hair hanging down off the cap.
Repeat this process placing the line of glue about 1/4 of an inch above the first line of hair.
The second ring of hair will overlap the first ring, and cover the glue line. Trim hair to the same length as the first ring. Let dry.
Add one last ring at the crown of the head. Let dry
Place a small dot of glue at the very top of the cap, press a long lock of hair into the dot. This lock should start at the level of the bangs in the front, and go completely over the top to the back of the neck. Let dry.
This lock can also be sewn down with thread matching the hair color. This will cover any glue that shows through at the crown of the head.
For the basic pulled back from the face style:
Run the first line of glue on the front of the cap on the underside of the cap. This hair will be pulled back over the top hiding the front of the cap, and provides a natural looking hairline.
Run the second line of glue around the outside of the wig cap, and add the hair, so the hair hangs straight down off the cap. Trim or pull the hair away leaving the hair hanging down off the cap.
Repeat this process placing the line of glue about 1/4 of an inch above the first line of hair.
The second ring of hair will overlap the first ring, and cover the glue line. Trim hair to the same length as the first ring. Let dry.
Add one last ring at the crown of the head. Let dry
A hot glue gun makes the gluing go a lot faster, as the next step can be done as soon as the glue cools.
When working with a glue gun, keep a glass of ice water nearby. If you get glue on your hand or fingers, dunk them in the water, the ice water will cool the glue instantly, and prevent, or minimize burns.
Any glue that shows on the top of the wig, can be colored with a sharpie, or magic marker that is the same color as the hair.
A wig stand can be made out of a large wooden bead, choose one that is the same size as the doll head, and a bit of doweling. Glue the bead to the dowel, presto! Instant wig stand.
Roving Hair for dolls can be purchased at fabric stores, and craft shops. This is almost always sold as roving. The fibers in roving are parallel but not the same length, and the ends are not lined up.
Mohair Mohair for wig making on the other hand is sold in locks. The cut end of the lock should be glued to the wig cap. The locks of hairs are the same length, and cut ends are aligned. Mohair is nice for making long hair wigs. It is the correct texture for hair, and usual has a nice wave that adds a realistic touch to the doll. Mohair also has the shine of hair. Wool, the usual component in roving has a flat finish, and works well for short wigs.
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