if you really want to truly memorize it, outside of doing the ritual in your free time, try to memorize the 72 RTR in chunks. write it down what you think comes next, and keep going until you get it right over and over, and until you can do all 72 without error, might take you a few months or a year of consistent practice but you'll get it down, and after you get it down, then do it several hundred repetitions of memory recall, like 300 memory recalls, like a few times a day, to truly retain it, or you could just print it out and keep it in a safe place, I'd only resort to truly memorizing something if you are left no choice, (your freedom being taken away from you is one example I can think of, or being in a tyrannical system where you cannot have it on hand at all.)