2. Play Golf, Not Golf Swing
One of the biggest and most common mistakes golfers make during the course of a round is spending too much time focusing on their mechanics. Don't let yourself fall into this trap. When you tinker with your swing during a round of golf, not only do your mechanics tend to get worse, but you also lose sight of your objective—to play the game of golf. When you get wrapped up in swing fundamentals on the course, you're not playing golf, you're playing golf swing.
The next time you warm up on the range, note how well you're swinging that day. You may not have your A swing; in fact, you may have your B or even C swing. In any case, it's important to take whatever swing you have that day and make the best of it. If you've got a little fade going on the range before the round, aim a little more left than you normally would during the round and worry about straightening it out after you play. Your task for the day is to shoot an A score with your B or C swing. When you learn to do that, you'll really be playing golf.