The notes of this sonata (and yes, I mean notes) are not that difficult. Unfortunately (or fortunately, maybe) with mostly all mid-to-late Beethoven, the notes are just the beginning of the piece. They require a maturity and consciousness about tone, texture, etc. that just isn't present in many of the early sonatas. I know a lot of high school students who can play the notes of the Appassionata, Waldstein, and many other of the mature Beethoven works, but to this day I have never heard one live (myself included) who could play any of them like an artist. The one mid-to-late Beethoven Sonata I've ever delved into was the Appassionata, and after working on it for half a year and performing it several times, I realized that I simply was not (and am not) ready for it. I think I'll return to the Appassionata and hopefully work on many other mature Beethoven works, but definitely not for a few more years.