STOP playing these pieces if you're self-taught
(www.youtube.com)https://www.youtube.com/watch?v=gtSPA0cUTuIThe pieces that the video warns against are, Chopin Fantaise impromptu opus 66, Beethoven Moonlight Sonata third movement, Rachmaninoff Prelude opus 23 no 5, Chopin Etude opus 25 no 11 "Winter winds", La Campanella.
Well, that killed the click bait, but you still have to watch the video because the reasons he gives are interesting. I particularly appreciated the point that the three against four poly rhythm in the Fantaise impromptu takes forever to learn, so an amateur pianist will get frustrated and give up. That is not exactly what happened to me. I realized that Chopin has a specific three against four study, "Composées pour la Méthode des Méthodes de Moscheles et Fétis" so I switched to that. Then I became frustrated and gave up.