One huge example of the difference

One huge example of the difference between the golfer that makes it in tournament play and the one that doesn’t is his/her pre-shot routine. Golfers that play a significant amount of tournament play eventually learn this. You'll also pick it up by playing with better golfers.

Your challenge is to swing a golf club the same way almost every time. I say almost being that the occasion does present itself when you need to hit a knock down shot which calls for a variation from your normal swing motion. For the most part you need to swing the golf club the same way every time whether it's your driver or your wedge. That process begins by approaching the ball the same way every time. In fact Lee Trevino stated that the timing of a golf shot begins the moment you make your first step towards the address position. I agree.