Kris: Ok, here are the basics, Lauryn, you can just refresh on this: Your body is not yours. It the shell your self houses itself in. Your body is not fixed. This is why it can change.
Kris: Now, apart fron that, everything else is more or less just like using transfiguration, just without a wand, and on yourself. To start off with, you should try with your wand, and we can help you through the steps. How do you want to change first: an animal change, or hair?