I find the piece the hardest oneI practiced till now. The etude is quite strange. If you start practicing you think, a it's ok, I can handle the first page without many problems a tempo. But then you've got another 5 pages of those arpeggio's which keep on getting more and more difficult
. It's just incredibily tiring. I must be totally relaxed if I play it (which wasn't really the case at the concert; I was very very nervous). Because I played only 2 pieces that evening, maybe it wasn't that smart of me to play this ambitious etude. I hadn't enough time to lose the tension.