I would suggest you practice, like cacciatore, suggests, with the gear you could be toting and wearing from all different shooting positions. Standing, kneeling, crouched, shooting uphill and downhill. I also think practice using mental visualization is important, being able to hold your bow at full draw up to 30 seconds or longer. When close to a bull I try to anticipate where he will walk and when I can draw and where the shot can be taken. Every bull I have taken has required me to hold at full draw for a while, until they cleared an obstacle or decided that in just a few more steps they will be able to see that love sick cow or impudent spike. When practicing on 3D targets remember low leakers leave more blood to follow and elk do react to the shot, especially if they catch a glimpse of your movement.