Stick the doll's head in near boiling water first to soften the plastic then slowly work it off over the post in the head. I just decapitated a Draculaura and a Ghoulia earlier today for use with the CaM vampire and werewolf heads and that is how I did it. The key is to work slowly and not pull too hard.
pull straight off dont bend and twist it. i ran mind under hot water and pop.
I personally place the doll infront of my space heater or a blow dried and once the plastic is warm and easily malleable I slowly and carefully manipulate the doll's head off.
Thanks Guys! I will use your ideas tomorrow, I will tell you how it works out :)
I know this post is old, but I have the same problem and it's not working for me. I'm terrified of the neck breaking. The green joint of the neck even got a little white from the twisting and pulling.
I squeeze de doll's head in order to "see" a little inside and help me out but nothing. I'm too scared to break it.