Hand Size On The Piano?

Don't worry about it. Practice and it'll be fine because both my hands can reach just an octave and I've learned both those songs successfully. Fantaisie Impromptu wasn't so difficult to learn, just play it very slowly and you'll get the hang of the awkward timing after a while (you don't need big hands for that) :P As for La Campanella, I just practiced my butt off and somehow managed it. But I was lucky because even though my hands are small, they seemed to be right for that song.