Hi all - I discovered your lovely forum a couple of days ago and after doing some reading would appreciate some advice please.
I'm an adult beginner (40 years old) who has just taken grade 1 (ABRSM) so very much a novice. My current long term goal is to be able to play the Chopin Nocturnes well. I have some way to go

So far the hardest thing I am finding is to get a piece committed to memory and for it to stick there over time. e.g. I have practised the Chopin prelude in e minor for some time but still need to have the score with me and my rendition gets rusty quite quickly if I neglect it even for a few days.
Having read several posts by Bernhard I'm keen to try his method to learn my next piece but I want to make sure I am applying it correctly. Here is my understanding of it. I'd be grateful if anyone more experienced could correct where it is wrong or add anything that is missing.
1. Choose small sections of a piece to learn, each of which can be mastered in 20 minutes or less.
2. Practise the sections in there own practise 'slots' HS and HT to a level where they can be played correctly 7 times in a row (stop at 7).
3. Repeat the exercises the following day after giving the subconscious time to work its magic overnight.
4. Continue to practise each day until the sections are fully mastered and can be played correctly immediately.
5. When the piece is complete, neglect it for a month or so and then come back to it and relearn it again to commit it to longer term memory.
6. Repeat as many times as needed to get it to 'stick'
The first question which comes to mind is:
Does mastered in 20 minutes mean to be able to play it at performance speed? e.g. for me I can quickly get HS up to speed on either hand but I find HT is about 10 times harder to accomplish at the correct speed. Should I be picking very small sections (e.g. a handful of notes) which I can master at the intended speed, or choose slightly longer sections (e.g. 2-3 bars) and increase the speed over a number of practise days?
MTIA
Siden1