Once you set your grip on the club with both hands equally, you do not want to change your grip pressure again until the swing is finished. That means NO ANXIOUS WAGGLING (a non-productive move that sets you up to flip). This conscious effort to not change your grip pressure will force you to learn (and use) the Large Muscles to control your swing. To replace the waggle, you can simulate your takeaway by pushing everything (arms and club), straight back with your front shoulder. This will give you a feeling (rehearsal) of how the takeaway will start. Now again, once you have the club gripped, maintain a constant equal grip pressure during the entire swing. This takes a conscious effort to learn at first, but will greatly improve your golf swing. This also takes some practice to become part of your swing. Once you have learned to swing the club with passive hands, you will instantly be aware of when your hands do take over and stop the Large Muscles from controlling your swing.
One of my Future websites (http://grippressure.com) will be solely devoted to this (it is that important). I believe a change in Grip Pressure during the swing, to be one of the biggest problems in the golf swing but, once controlled, one of the easiest paths to a much more reliable golf game.