THere are the basics...
Start with a structural analysis
Look for patterns in either hand while playing H.S.
Try to hum the melody as you play slowly.
Using consistent fingering usually helps a little
Look for melody in the accompaniement. (you're lucky cause Chopin has melodious accompaniements with descending bass lines, etc..)
Do some basic analysis and try to grasp the overall harmonic pacing and structure. (you want to look for repeated chords, inversions, and cadential points)
Other than that, the #1 thing I can say is to
Never 
rely on muscle memory.
unless you like sitting on the stage looking blankly at your limp hands....
If you can play the song through at 1\4 speed, from memory, then you have a reliable memory of the song...
Good luck
