Judging distance has always been a little tougher for me because I can only see out of one eye (accident in grade school). Anyhow, I had to really work and practice at it while growing up. No one is going to get good at judging distance by stepping up to the 20 yard line and pounding arrows in a target all day long. I'm sure it comes more natural to some people, and tough for others. My arrow speed/trajectory is somewhere in the middle of the road I would guess. One thing I will do if I am in a stand with multiple trails and shooting lanes, is hang a couple small pieces of colored marking tape on the side of a tree about chest high on a deer, near where I expect to get the shot. That allows me to judge how far the deer is from my marking tape, rather than from the base of my tree.

--Man who fish in other man's well often catch crabs--