Slow = great advice.
I have a book of his etudes, and I looked through this one. I got pretty comfortable with the last page (it's my favorite part; the dramatic climax there is crazy!). Make sure you are getting all the notes at a slow speed, and move it up bit by bit. Don't go too quick into things, you may be shortcutting some notes, and leaving out some of those repeated bits.
The second page is psycho though... definitely go slow.