Practice! Practice! Practice! And evaluate every shot! Also, have your broad heads razor sharp, be ready for Murphy's Law, which is governed by Mc Connell's Theorm - Murphy is an optimist! I am the least qualified as a bowhunter, but you fight like you train, and hunt like you practice. As GunDoc and others say, Shot placement fills the pot! As an HE instructor, I teach shot placement and practice with your hunting equipment until you are proficient! The kill zone on deer is about 8" +/-! Regardless of weapon or range.
Hawkdancer