Well I want to agree with Bosendorfer_214.
I have played this piece as well, and it's just a matter of dedicated and thorough study! Then you WILL achieve the technique that is necessary to play this etude well!
The bars where the left hand is leaping octaves, don't think too strictly of a legato, but think in "positions".
And when you've got to throw a finger over/under another finger, make sure the previous finger is very strong after strucking the key (When ascending, it's always the thumb) so that you can "lean" on it (?My english problaby is very good

?)
I hope that this will help you a bit, it worked for me.
The passage I find the most difficult, is the one that starts in G Sharp minor!
I'd like to tell you one more time that you should challenge yourself, by studying this etude with PATIENCE, and I'm sure, you will be satisfied after a couple of weeks!!
Remon