This was the first Chopin etude I learned at about 16, and it wasn't terribly hard. As others have said, it took a bit of memorization, but my teacher had me focus over and over in the "difficult" section, and after a couple of weeks I was executing well & had memorized it. If you're teaching it, if you can convince your student to memorize the hard part for a few hours, it will make it a joy to play. It took me far longer to master 10/4 and 10/12.
Interestingly, as I'm picking the piano back up 18 years later, i found I was able to brush off the 10/4 and 10/12 reasonably well, but am having to completely relearn the 10/3.