I may have asked this before, but it still hasn't sunk in yet...
You plan out your piece. You begin working the plan, but at some point the piece is beyond your technique, not necessarily outrageously beyond your technique though.
What do you do?
How do you get that technique?
What do you do with your original plan?
At some point, if you've learned everything you can about the piece, but it's just a matter of playing a little bit more than you can, wouldn't the piece turn into a technical etude for you? Unless, you just give up on it for awhile... Say you have the piece well under your fingers, memorized even, you know everything about it, know exactly how you want to interprete it... it's just a matter of being able to play 10 clicks faster on the metronome, or say 20 clicks, or 30?
It would also seem that in the pursuit of that technique, you might let nuances and things slide because those are no longer the goal -- the goal is attain that missing technique and put it back into the piece. The piece can turn into notes and rhythms.
Working section by section really isn't the answer because it's not a matter of learning the piece. It's a matter of developing more technique.
Any ideas for getting out of this situation? The answers I can think of is to vigorously go after that technique, have the technique before you even begin the piece, or just give up and be happy with what you can accomplish on the piece.