It helps to spend a lot of time close to deer and other game animals.Try to spend as much time as you can,before season getting close to them and working through an imaginary shot.You may not want to spook deer in your hunting area before season,doing this but you can do this anywhere even in parks.Try doing close stalks and use your camera while you are at it.Play the wind,make the draw and release.imagine this is the real thing.
The more time you spend close to deer,the calmer you will be when it happens hunting.All too often,when the deer comes into range for a shot,that may be one of the first deer we have been close to for several months.It gets exciting.
When the moment of truth comes,forget any thought about the outcome.Make it all about concentrating on making a good shot on a target,just like at home.Don't worry about not getting the deer or how great it will be to bring it home.Put any thoughts about success or failure out of your head and as much as you can,make it about the mechanics of the shot and the tiny spot you have picked to concentate on.Don't get too much tunnel vision however that you aren't also keeping track around you.There could be does watching you draw etc.
You also have know that your head won't explode if you don't get to take the deer home.At worst,you will get to keep hunting and you had some excitement.That's a very good thing.