First off, you should have left the hide onuntil you were ready to butcher. The meat does`nt dry out that way plus the meat stays clean and you won`t get that "crust" on the meat.
Your best bet for butchering if not too sure, is to buy any one of a 100 different "how to" books on the subject as you are probably going to get quite a few different answers to this post which may cause some confusion.
Plus, the meat always seems to taste better when you butcher yourself and you know it is your meat. Good luck.

Ron