Like mentioned before every situation is different. Even if you think you drew you bow back at the perfect time the deer can and often do change their minds and go either around or through your shooting lane. One thing I have practiced and feel is a very important and that is to hold my bow at full draw for a long time, until I get the shakes bad. After I start shaking Ill bear down and shoot. I try and make this part of every practice sesion. One it helps you be able to hold the bow longer, gets you better at making the shot when your arms dont have much left in them, and trying to make a perfect shot when your arms are shaking is about as close to the real thing as you can get.