I played this about 2 years ago, still something that I'm playing today! After the introduction, after the two ritardandos, and the fermata comes the nice octave/chord section. I had more trouble than anything getting the dynamics to suit the notes (let alone get the notes right). Melody in the upper right hand has to stand out, and the left hand must support it. Make sure you don't pound out the left hand notes, but make sure they are heard.
--actually I take that back, right after the octave jumps in the left hand following the right hand chords, there's a ritardando with three right hand chords accompanied by descending octave jumps in left hand ( I hope I described that part ok)... notorious section, it has to be brought out, and [most] editions require a crescendo here.. That is probably the most technical part of this piece.
The majority of the middle section is extremely lyrical and soft, make sure you create that atmosphere when playing. Use some rubatos, just enough so that there is still a pulse. In the parts where there are running notes (I'm mostly talking about the part coming right after the octave sections) keep the left hand notes legato, even though there are massive jumps. The pedal helps here, but you should try to keep the non-staccato touch here with left hand...
Ya, that was most of the stuff that I really worked at when I learnt this, hopefully I helped a little . lol if you need any more advice/insight, just reply whenever.
Take care!