If you watch professional golf tournaments on TV, undoubtedly you will see the professionals doing some sort of waggle before each shot.  The waggle is crucial to set the pace and shape of the swing.

You want to incorporate a waggle into your swing to rehearse your takeaway. The objective is to waggle the clubhead on the same path that you want to take the club back.  Most high handicappers tend to whip the club too far inside  in attempt to get behind the ball.   Well, if you do this, then your swing is already off plane.

You want to waggle the club with the clubhead outside your hands moving the clubhead straight back.  This keeps the club on plane. Making waggles will also help reduce tension in your hands and arms for a smooth takeaway.