The position of the shoulders at address is one of the least involved but most important aspects of golf. Properly positioned, the shoulders can be the key to a very good swing. Improperly set, they start a chain reaction of wrong moves. For example, if your shoulders are level at address—parallel to the gound—then your hands have to start off well behind the ball. As a result, you may find that during the swing you are making some unnatural adjustment to get your hands forward and into the correct hitting position. However, if your shoulders are properly angled your hands almost have to get into their correct position during the swing.
To set your shoulders, first place your feet, then hold your club and stand up straight. Next, relax your shoulders slightly, and as you take your normal grip and place the club behind the ball notice how your right shoulder drops until it is somewhat lower than the left. This is the correct position. Do not exaggerate it by dropping the right shoulder more or forcing the left shoulder up.