I am going to have to ask my teacher, because I've forgotten some of the things he told me. But one thing I do remember - one technique is to memorize each hand separately. Supposedly, if you can play each hand by memory, then you have a better chance at playing hands together memorized. Oh - I just remembered another technique, which is to play the piece at a super, super slow tempo - like 'snail's pace' slow without looking at the music. Sounds easy but it's not. You have to totally rely on your 'brain memory' instead of 'muscle memory'.
Thanks, Monica! I've been trying to memorize both hands separately in Brahms Opus 117, which works fine in no 2. I'll try both techniques - I've got two and a half weeks, that'll do.
I'm actually very much looking forward to playing the next recital, which will be in a late 19th century neo-gothic church, somewhere in the middle of nowhere in the sort of north of Germany (that's where I work). The church was built at around the same time Brahms composed his opus 117...
Both of these techniques are like torture for me, though, since I am so impatient.
I see what you mean, I'm also very impatient. That's why I barely practise both hands separately when I start playing a new piece, I go for both hands together immediately. I only practise both hands separately when I start running into difficulties. I know that's stupid and maybe that explains why it takes me ages to learn a new piece. Maybe I should practise more systematically.