Practice parts of a triple, so that you practice doing the last two peels, or practice the four back peel and do the few shots that lead up to that. And practice that again and again four or five times rather than practice the whole triple. Or practice parts of a leave three or four times so that you just get a feeling of what small differences there are in terms of where the balls are when you do it four or five times in quick succession. Or just even if you're just starting the game, getting rushes after hoops where you want them to go. Just keep practicing that bit for ten or fifteen minutes.
Some players love American rules.
Others hate it. With such a penalty, many American rules players never risk the aggressiveness needed to build and run breaks. That's how you get started, as far as I'm concerned. That's basically the first think I knew about the game. We didn't know very much about the ending, but we DID know that you were supposed to start off playing breaks.