I have taken the passages apart, played them adding one note at a time from the beginning to the end and from the end to the beginning. I have played them with different rhythms, with different articulations and I think I can safely say that my fingers now know what they are supposed to be doing.
BUT
when I play the whole piece I can feel myself tensing up as I approach these passages and somehow, even though there is a crescendo marked and I know I should be increasing the volume of air, every time I find myself withholding air with the result that not only is there no crescendo but that very often the last few notes don't come out. Sometimes it is even worse and my fingers tense up so much they can't move fast enough either.
How do I convince myself that I CAN play these passages and let myself breathe freely?
(Perhaps I should add that I am quite stressed about the pieces as I have only spent two lessons on them and am supposed to be playing them in a Masterclass in just under two weeks time and that it is currently half-term which in France means two weeks without lessons).
