I can't speak for anyone else,I still come unglued from time to time. I have found a method that has paid big dividens in the last four to five years.
I believe that buck fever is a natural thing. So I don't fight it. It is what you do with it in the first few seconds after it shows up.
It Gods way of preparing our body for the task at hand. For many of us, we then take the wrong track, we begin to worry about what might go wrong. I turn it around and play a slightly different recording. I expect a positive out come, I visualize the arrow going through the spot I am going to hit, not just once, but over and over until the act is completed for real.
A friend of mind tells me that he keeps convincing himself that he doesn't want to take the animal. The whole while he is preparing for the shot, and then as he reaches full draw, he drops the string. It works for him...