Walk through house with cups of hot coffee in each hand, full ones. Can use water of course, but nothing like the sting of hot coffee on bare flesh to remind you to keep hands still and to give with the motion of your walking.
Also, if you are a fidgeter off a horse, as in your hands are never still? Quit that too, as it will follow you into the saddle.
When you ride you will have to work to keep hands as well as everything else in position. Concentrate harder on your hands.
Horses make me a better person.