It would be impossible to have an empty mind for 5+ hours during a round, unless you were either drunk (not too bad a thought), or just plain "empty minded" to begin with.

So the real trick to to be empty only for the 30 seconds you are done evaluating your position and have your shot in hand.

This is the drill at the driving range, where you are in the middle of your session, play 10 identical shots without thinking about the swing at all. All you are doing is going through your full pre-shot routine. This puts your head into a very confortable, predictable and thoughtless state.

Practice this enough on the range, and you become better at it on the course.

After the shot on the course, relax, have fun, chat, yell what ever makes you happy playing while you move to the next shot, but when you get to that 30 second pre-shot again for the next shot, revert back to your 10-ball pre-shot driving range routine again. This will make you as empty-minded as you can get.

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I'm a golfaholic, no question about that. Counseling wouldn't help me. They'd have to put me in prison, and then I'd talk the warden into building a hole or two and teach him how to play. ~Lee Trevino