If someone has an "easy" way to tan deer hides I am sure he could get rich. Unless you have access to commercial equipment it is a labor intensive proposition. I have done a few hides and each time I say I'm not going to do anymore. After I did the first one I said I understood why the Indians went mostly naked.
You can just put it in a bucket of water and eventually the hair will slip, but lye or wood ashes will hasten it some. You just have to keep checking it from time to time. If you are not careful it will spoil. It always seems the hair on the shoulder is the hardest to get off. Some of it will peel off easy and some hard. After the hair is off you still have to "tan" it. There are several methods and a lot of books out there but no matter what method you use you still have to add a lot of elbow grease.