I've always loved to bow hunt and have since I was of legal age.  I had a good teacher, when it came to hunting....not shooting.  My dad shoots fingers, 20 yards and less, never more than that (very good at it too).  Growing up, that was how far all my shots were (whitetails).  After I started hunting other species I realized that while a 20 yard shot is nice, 40-50 yard accuracy sure opens up some options out west.  I also realized that better gear, more practice sessions and a release aid made all the difference in the world.  
When I got to Idaho I started shooting 3D, again I was never very good at it... I could hold my own, but I just drew back and shot; never really thought much about it.  After that first year I realized that shooting 3D was a good thing.  Judging yardage was the key and executing a perfect shot every time was the goal.  I got better, started placing at a few shoots and overall just had a great time.  It helped my hunting (shooting/judging yardage) a lot.  
While all of that is important, nothing can replicate shooting animals... I was fortunate enough to shoot several deer a season back east when I was younger and "being there" time and time again sure made things easier for me down the road.  I don't really get nervous any more when I take a shot or am about to take a shot.  I feel it, but I don't allow it to take over me.  Whereas my wife, who has only shot a few animals with her bow totally comes unglued when it's time to shoot!  I have seen others do the same thing.  Most haven't had the opportunity to really fine tune their skills on live animals under hunting situations and I feel that the more you are exposed to that, the better off you will be.  
Do I still miss?  You bet, I also have been known to make a bad shot or two now and again... Lately it's been due to being impatient and nothing to do with anything else...  I know that to be the case so I am constantly telling myself it during a stalk or before a shot.  It has helped.
Everyone has room for improvement and that is why I practice as much as I can.