The following drill does not involve a golf cart, chair, or couch, nevertheless you do need a fifteen to twenty foot long hitting spot. If you do not have fairway height grass from which to hit at home, I suggest that go to a practice tee. You also need a seven-iron, three tees and one to two dozen balls.
Firstly, place the three tees in the ground in a line, with just about six inches between each tee, but do not put balls on the tees. The tees would stick no more than half an inch out of the ground. Next, gripping the seven-iron, set up to the first tee as if there were a ball on it. Get the club back to parallel position just as you did in the first drill, and make sure that your forearms rotate, the wrists cock, and the back of the left hand and club face pointing away from your body.
For the down stroke and follow through, this is not about a hard swing, but a swing with enough drive to brush or pop the tee out of the ground. Permit the weight of the club head to work its way down and brush the tee. Of course, the idea is to guarantee that your wrists, hands, and forearms are in the proper positions and are performing correctly.
When the club starts down and forward, you want your forearms to rotate and your wrists to unhinge naturally. If you are a right handed player, it is crucial that you do not force the club down with the right hand. Likewise, left handed golfers must not force the club down with the left hand. Remember, this needs to be a relaxed action. All you want to do is brush the tee, not produce club speed.
Repeat the drill, brushing the second and third tees out of the ground similar to what you did in the first. In addition, place the tees back in the ground and keep brushing them until you feel comfy. When you are practicing this, remember that your wrists, hands, and forearms must work as one unit. Going from the takeaway to parallel position should be one smooth motion. The down stroke, brushing of the tee, and follow-through also should be one smooth motion. The more you practice this drill, the more ordinary it will feel. Ultimately, the takeaway, down stroke, brushing of the tee, and follow through would be one continuous action.
I wish you happy practicing!