For me, I get "Buck Fever" even on does. The best thing I've found, is that once you've figured out it is a shooter, buck or whatever. Picture the shot. Be ready to stop the deer in the shooting lane that you think is your best option for making a clean, quick harvest, but don't rush it. If you aren't ready for the first shooting lane, let it continue on the path. Don't rush things. It might be your only chance at that deer.
As the deer approaches, picture the deer naked (not naked naked, but where it's vitals are). Start focusing on the deer and where you are going to put your pin, or sights. Whatever you do, don't look at the antlers again. I keep my mouth closed, and breathe out of my nose. To help slow my heartbeat. As less intake of air helps me focus more on my shot. When that deer's head is behind a tree, or when it looks the other direction that's when you get ready for your shot, i.e. draw back, raise your gun whatever it may be.
The biggest thing for me, is to not focus on the antlers or how good it is going to taste with a side of mashed potatoes. Rather focusing on the shot placement. I actually try to pick out an exact hair where I want to hit. Like others have said, aim small, miss small. It works, just try to control your breathing, and that can be done by different methods, for me, it's just breathing through my nose, and not looking at the antlers on it's head.