Practising Chopin Ballade op23 no1

[jessipch]

I have been self learning chopin ballade op23 no1 in g minor for about a month. I have been learning pieces at ATCL level for 2 years and a half. Recently, I have worked on Rachmanonff Prelude G Minor Op 23 No 5 (But struggle a lot at the middle counterpoint parts). I know the presto con fuoco would be hard. But, I feel like I am stuck on B.138 onwards for the ballade. I cannot play both hand together at a normal tempo when arriving at B.138. My efficiency kind of falls a lot. For the beginning part until B.123, I can feel I was making progress. But now I am completely stuck on a few bars everyday.

I know there are a lot of technique to work on for this piece. How do you guys specifically work on those harder parts (Like those from B.138)? Like how you organise the section into simpler elements and practice them? Or do you have any tips in practising?
Besides, I have encountered the passage with left hand doing crazy arpeggio like in B.166-190, or the rach g minor prelude, every time I will be stuck here also. How can I practise these efficiently? Thank you!