When attempting an intentional hook, you should not rely simply on a strong grip and a closed stance to produce the desired effect. They are not enough. The most important element in hitting a hook lies in the swing itself, in keeping the right shoulder underneath the left as the hands and club head go out through the ball. This action—provided the other adjustments have been made—will not only produce a hook, but a hook that will stay under control and land softly.
You should begin by picking a preliminary target, say a tree or bush, to the right of the real target. Align your stance and square the club face to this aiming point. Play the ball in the normal position, but adjust your grip, turning the hands slightly more to the right than usual. This will help the right hand to roll over at impact, producing hook spin. On the downswing make sure that your head stays absolutely still. Your hands should come from the inside, almost giving you the feeling that they are going to brush your hip as they go by. The right shoulder stays underneath the left, and the hands go out toward the preliminary target and finish high. To re-create the feel of the shot, visualize a soft ball pitcher throwing underhand toward the plate.