I pick a spot on the deer where the arrow is going to go in and try to invision the best spot for it to come out. That is how i decide where to shoot. I know the anatomy of deer so depending on the angle of the shot I adjust, and put my pins accordingly to where it is going to come out. So, I do pick a spot on the deer, but not a single hair. If you say you are picking a single hair out to aim at, I'm calling BS Unless the deer is like 5 yards away.