...practice a difficult piece like this etude...
You should not attempt this etude if you think it is difficult.
Every piece I attempt is difficult. By the time I've learnt it, it's easy.
Leaving the semantics aside, in fact what I mean is quite clear.
Let me try to guide the OP in the right way that I know and believe:
IMO, If you are not able to play it at a reasonable pace, say at 2/3 of the indicated tempo, after practicing it slowly for 2 or 3 days, then just leave it for now. IMO, It is not practical to gain technique by trying to play pieces that are much advanced than one's current level.