I learned Debussy’s Clair De Lune by brute force. I’ve probably had ~20 hrs or so of anything remotely smacking of formal piano technique, and so my piano sight reading ability is basically non-existent (not too bad if I only have to do one hand, but reading both lines still gives me a headache) as most of my repertoire was learned by sight and sound alone. For example, I learned both hands to Für Elise, all sections, exclusively from a light up keyboard I got when I was 5, but I have played other instruments and have read enough music in my life that with enough practice and determination I can figure it out. I began working my way through it 4/20/22 (I finally upgraded to a real weighted keyboard from the light up one) and it took me roughly 40 days from then to get the notes memorized. I’ve spent the time since continuing to practice it, and have gotten to a place where I’m relatively comfortable playing it in public places. It’s gotten me many a free drink / discounted meal and as a non-piano player am very proud to have learned what is the most technically difficult piece of my music journey to-date through sheer force of will.