Saint Duffers golf tips no. 6:

Perfect Golf Swing - How to Develop it
True artists learn their art in the classroom and construct their art outside with a clear mind. This approach will help you to enjoy developing the art of golf. On the driving range and in a lesson you can work on individual swing mechanics but on the course this will destroy your game. Out on the golf course is the time to clear your mind. When you take a swing you should be thinking only of where you want the ball to go.
Technical thoughts at this point will, almost certainly, destroy the shot.