Well, my teacher did a good job. Before I learned the piece, my teacher already learned me to play the 3rds with 2-4 fingering before I even started to learn this piece. I practised that part a lot and I did a lot of octave work too. My teacher did this cause my technique wasn't ready yet to begin learning Mazeppa. And imo he did a good job with that, cause when I started learning Mazeppa it was easier than I expected (but still it's hard).
When I started learning the piece, I started with the intro, and the ending. In the beginning my teacher told me to play the part with the 3rds (let's call it the "main" part of Mazeppa), to play it without the 3rds first, just to get a hang of the timing etc. of the song. After I mastered that I started to add the 2-4 fingering, wich I already practised a lot, so at that time, it wasn't that hard to "combine" the two things, if you know what I mean.
After that I kinda learned the rest of the song. It was a lot of work and some people told me it's a kinda weird way to learn Mazeppa, but my teacher did great teaching me this piece imo.
When I'm at my brother's place again, I will record some more stuff, Feux Follets maybe?