Most golfers play by sight, sound and feel. If your clubs do not look good, sound good and feel good, it makes the game very difficult. Of course, there are exceptions to this rule as there are good blind golfers and deaf golfers.
The one element most good players have is feel. In order to hit the shot the way you want to hit it, you must feel what you want to do before you attempt the shot.
Good visualization of a shot leads to feeling the shot. This is where the hands in the golf swing are so important.
The only communication with the golf club that you have is with your hands. It is my belief you have to know where your hands are during the swing and what they are doing from the start of the swing to the finish.
The better your grip is, the easier it is to have your hands work properly during the swing and stay on the proper swing plane.
When you start the backswing and your lead arm (left arm for right-handed golfers) is parallel to the ground, the back of your left hand should be at an angle of about 45 degrees.
On the through-swing, the back of your right hand should be at about 45 degrees when your right arm is parallel to the ground. By achieving these positions it will be easier to stay on a consistent plane around your body.
Remember, whatever position your hands are in during your swing, that is the position of the clubhead. Know what your hands are doing and you will know what the clubhead is doing.