Practice swinging setting the club on your shoulder on the backswing and the other shoulder on the follow-through. Swing without tension.
If you struggle with keeping your hands in the same position from address to impact position, it’s because you start with your hands way too low.
Swinging the driver while on your knees is a great exercise to feel how your arms loosen up and your wrists work.
The L to L Drill uses the lever system by creating 90-degree angles. Make an L on the backswing and a reverse L on the follow-through.