Everyone is different. I don't get much buck fever at all when a deer come into sight. I prepare my mind when a deer comes to me that I want to shoot with "its not in the freezer until after I execute a clean killing shot". It works for me by preparing my mind first with making a good clean kill shot.
I missed deer early on in my bowhunting career mainly due to shooting at the whole animal instead of picking a hair. Also missed due to some buck fever. Soon after I came to terms with defeating buck fever and missing by preparing my mind prior to the actual shot by walking through the entire sequence first by picking a spot...and thinking aim small miss small. Its easier said than done but it works for me.
Ron