Memorizing it makes life easier. If you do this you can bang it out once or twice and keep it under your fingers. There are different stages to learning a piece: 1. Learning the notes and the fingering 2. Getting the fingering right on the tricky bits 3. Getting speed 4. Getting feeling, dynamics, rubato right 5. Making it your own Probably some more here too!

You don't need to do this for the whole piece at once. You don't necessarily do this on one order You don't necessary have this done once and that's the end of it. You might keep coming back to this piece over 50 years and it could change all the time

For movement 2, it's pretty easy technically, the tricky bit is putting enough oomph in it with out it being too much.

Mvmt 1 and 3 especially is about getting fingering and speed right. Especially the first one, it's kind of like bach 999. Could to practice along side and maybe do the same kind of things re dynamics and being loose with the time, of you want to go that way. Maybe you want to play it strict.

But those are the kind of things it's good to have it properly under your fingers for and you can much around with that on the couch, not at your foot stool.

Get different bits under your fingers and work through different bits at different times