Tell me, how much Bach have you played? The answer decides if you can play it. My Maestro that I studied with would not let me play a thing by Chopin, till I had played all Bach's inventions, and all preludes and Fugues from well tempered clavier. THEN he let me play mazurkas, waltzs, and nocturnes by Chopin. It is needed to note, that my teacher graduated from a European Conservatory. In Italy. He performs world wide, you might have heard of him, His name is Stephen Vaglica. If you want to play good Chopin, you must play good Bach...
I haven't played much "substantial" work by Bach, perhaps a few of his easier pieces when I was younger but nothing recent enough to remember.
I think I'll probably have to look up some youtube videos for the middle section, especially for the fingering.
Pity - did you at least play some Well Tempered Clavier? The whole work (Books I and II) is considered by some as the "Old Testament" of piano technique, and well worth a study. Even if just a few easier ones to begin with. With some of the more difficult P&F, I swear you need 6 fingers in each hand to play! Those will require some understanding of advanced fingering to execute properly.
It's interesting how some of the greatest composers don't have huge hands for playing the piano (of course there is still Rachmaninoff).
I checked earlier today and I can cleanly strike an eighth and stretch for a ninth, I don't think I can make a tenth though