The absolute best thing to do is to drill it into your mind,
so that whenever your mind wanders it automaticaly jumps to doing an RC. For instance whenever i forget my keys i also remember to do an RC, wenever i start to day dream i purposefully day dream about lucidity etc. Off course I also have rc written on my hand and i do one everytime i sit down ( This is the hardest). I believe that associating body parts or worldy actions to a RC is relativily hard compared to just making yourself obsessed with it lol . Good luck