When I see a buck that I know is a shooter, or any deer for that matter, even doe give me a rush after the shot, I "shut off" the... emotion or whatever you want to call it. If a non shooter walks in I sit back and enjoy it, think about shooting angles, lanes, all that for practice. But as soon as I see a shooter it's game on. Shut it down, focus only on the mechanics of getting your shot off properly. So you see a shooter coming, stop thinking about the deer at that point. Plan when you're going to stand up, when you're going to turn your body for the shot, when you're going to draw, when you're going to release, take everything step by step. I've found if I'm thinking "wow, look at that buck!" I'm nervous. If I'm thinking "Ok, his heads begind a tree, stand up... Ok, turn to face him for the shot.... ok draw, ok release" I don't get nervous until after the shot is over. It took me several years to get this figured out, but this works for me.
-Jake