You probably know what good form is. When shooting, subconsciously make sure your form is correct and do the same thing every time you shoot. Concentrate on a small spot on your target. If you don't have a small spot on your target, take a magic marker and make a spot about the size of a quarter on it. Pretend you eyes are casting a laser beam to that spot. Like Tom said, you're aiming as you draw. Complete your draw, again making sure you are consistent with your form but don't break the concentration of that laser beam directly onto the spot. Once you hit your anchor, release the arrow within 1 or 2 seconds at the most. Start maybe 10-15 yards from the target and work your way back. Let your muscle memory do it's thing. It will take a while to develop the muscle memory. Remember muscle memory is just the programming of your internal computer (brain). In my experience, the more you concentrate on things other than the spot the less concentration you'll have for the spot.
That may sound the opposite of what Tom said, but you need to play around and see what works for you.