The hardest section for me was the D flat section i.e. the B section. The right hand of this part is stupidly difficult and doesn't fit under the hands well. Practise this part first, right hand only till you can play it faster than the normal speed. The left hand is a piece of cake here, but the co-ordination of both hands will be difficult, simply because it's quite demanding here.
Make sure you get a decent fingering for the opening hands together passage (the part where both hands play the same thing an octave apart) and the ending too. I could never find a fingering that wasn't awkward. Then again, I've forgotten most of this piece - I'll probably revisit it someday.
I always found the left hand of section A quite tiring. You need a fairly loose wrist here; if you use your fingers only to play this LH accompaniment, your hand will get quite tired easily. Use your wrist to aid the fingers, so that, to a certain extent, your wrist is moving the fingers, rather than the muscles of the forearm.