Welcome to the club, that's why we try so hard for that 10 seconds of adredaline. It takes years of shooting big bucks to calm you nerves and even then you'll get it. Look at the antlers and decided if your going to take him and then pick a spot, behind the shoulder, the only thing you should be looking at is brown. Take a deep breath and talk to yourself, let the action unfold in your mind like a movie, plan your shot in you head before the deer gets there. Best of luck