HEy SHooter,
I've done a fair bit of braintanning. If you want to make traditional buckskin, you're gonna have to take the hair off. If you want to tan it with the hair on, then you'll probably have to have it chemically tanned. Braintanning deerskin with the hair on creates 5 times more work for yourself. It can be done, but it'll wear you out trying to tan the skin with the hair on.