[quote author=pianistavt link=topic=71043.msg732932#msg732932 what other studies/etudes and how they went, would demonstrate some seriousness about the question and elicit some serious answers...
I have learned op 10 no 9 and op 25 no 2 and they both went smoothly. I have also played Debussy gradus ad parnassum,reverie, and the interrupted serenade,The last dance in bulgarian rhythm by Bartok,the first movement of Mozart piano concerto no 12, and his sonata no 2 first movement.