@Bruno Militz I do try different things with my left. For me right now, with all the renovation work, I switch hands when my right hand or arm start to feel tired, so I paint with both hands, clean up with both hands, use the scraper with both hands... But as a way to remind yourself I would suggest using a trigger and an anchor. The anchor is a way for you to "make a contract" with yourself, you agree that you will do certain new habit right after a current routine you have. For example, if you brush your teeth after dinner, after getting to the bathroom, switch the light on, and putting the toothpaste on your brush, you can anchor using the left hand by stating "every night after I finish dinner and I put the toothpaste in my toothbrush I will brush my teeth with my left hand". That's your anchor. And then you set a trigger, something that will remind you of the new behaviour. Let's say you always keep your toothbrush on a cup in the right side of the bathroom sink. Your trigger could be that you move your cup and toothbrush to a different spot, to the left for example. So you tie your new behaviour to a current routine with your anchor, and you remind yourself about it with the chosen trigger.