I have been known to peek around my peep with my other eye from time to time which can screw up a shot. I found the No-Peep fixed that, I can shoot with both eyes open and keep my anchor point throughout the shot process. Other than that practice practice practice, and experience. I have been bow hunting for 15 years and my early years were filled with all kinds of blunders, the more encounters you have with deerthe better you will become at focusing and calming down to make a good shot.