ADVICE! My solo isn't ready to perform?

I'm a clarinetist playing Menuet from Divertimento in D Major, by Mozart. It's got a crapload of very fast sixteenth notes, and some fancy trill work. It's decent, I suppose, but I just don't feel ready to play it. But I have to play it. At 9:00 tomorrow morning for solo & ensemble. I'm mad and sad at the same time, and I don't know what to do.
 
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