To loosen your hands and wrists, twirl or swing the club. This movement will help reduce tension.
Placing the club on your shoulder and swinging it back and forth to the other shoulder helps take the tension out of your swing.
A great way to hit your driver well is to drop your right foot back which allows you to open your hips.
Making half swings on the driving range before you play is a great way to practice clubface control and control of where the ball is going.