In addition to the neck plug removal and boiling advice, I'd like to mention that you can get the hair out without boiling and you can reuse the neck plug to have a turnable head.
Invest in a pair of hemostat pliers from your fishing section. I have a surgical set and a fishin set and the surgical ones were actually too big for me but the fishing ones are perfect. The glue in these new ponies is not that tough. I ut the hair off close to the scalp and then just rub the hemostats against the glue and then pull the hair out.
To get the plug back in, boiling works good. If you cannot boil it then stick a pencil in there for about 5 minutes to widen the hole. I like to grab the plug with a pair of pliers, I stick one bit into the hole in the bottom of the plug and just hold tight. Then pop the pencil out, cradle the head in your palm, then using a rocking motion, I push the plug back into the hole.
Best of luck to you!