I'm not sure exactly what you're asking--would like to be helpful, though. Could you be more specific? Do you mean the musical feel of the trill, like timing etc, or technically how to play it (which fingers or something like that)? I've played this, and I recall from past discussions of the piece that many other members have, also. If you can narrow down the question a little, I'm sure someone can help. Good luck!
Topic: rhapsody in blue 2