Take it from the top: do the arms/hands drop and turn the

shoulder or do the shoulders turn causing the arms to drop?

I always get to the top and can't decide it the shoulders should initiate the drop of the arms, or if the shoulders remain silent and the arms drop causing the shoulders to turn.

Transfer weight onto left foot (if your right handed), do this with a slight forward (towards target, try not to slide them though) flex of the hips, then the shoulders should follow and everything else should flow from there. As soon as the should start to drop your arms should just flow through.

One thing to try and I stress try as it doesnt work for me but I know it does for friends of mine is to feel as though you leave your hands at the top, fully cocked, as you bump laterally towards the target. Your arms will drop anyway but you are exaggerating the feeling of not having them move before the lower body does

Keep this all smooth and slow and then, when the club is parallel to the ground on the dowswing with the wrists still hinged you can throw your arms/shoulders/hands through the ball to release. Will take some getting used and some timing as this method means you would be releasing the club much later than you may be used to

I agree with the two comments above. The downward hand action should be a natural drop that occurs because of a slight lateral hip bump toward the target. If you go the the top of your swing and try this hip bump watch your hands naturally fall into the slot. Be careful not to sway into the left side only the lower body should be bumped not the upper as well. Takes some practice but can be very beneficial for consistency and length as well.