You do need to practice a lot before hunting. Some people take to it naturally and others struggle with it. When I started teaching my son, I started him at 10-15 yards, so it was a little easier for him, and he could concentrate more on his form, than the accuracy. As he improved we moved to 20 yards, then 30 and 40 yards.
He is an outstanding shot now...
When you first start hunting, limit your shots to a distance you can shoot well at. If its only 20 yards, keep your shots around 20 yards. Its the only fair and ethical thing to do for the animal. It does take self discipline to pass on shots that are less than ideal, but thats one of the things that makes bow hunting great.
After awhile you will appreciate the fact that you were so close to an animal, and got to watch and listen to them, and they didn't know you were there.
I've been 10-15 yards from elk numerous times, but couldn't get a clean shot, or knew I would get busted if I drew the bow. Very few people will get to experience anything like that in their life, and its nothing at all like watching it on the t.v... Even a season that I don't kill anything is a success, because of the memories and things I was fortunate enough to see in the woods