Masterclass

I just found out that my professor wants me to play in a masterclass on September 24th. My choir is doing a concert with the OU Accademia Filharmonica, in which we will be performing Beethoven's Choral Fantasy with guest pianist Christoph Hammer. The day before the concert, he will be giving a masterclass, in which he instructs students on the proper way to play classical-era music (Mozart, Haydn, etc.) on the fortepiano, which is the most immediate predecessor to the modern piano.

I'm going to perform the first movement of the Haydn sonata I'm learning.

AAAAAAAAAAAAHHHHHHHHHHHH
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For serious. I just want 5 minutes. Is that so hard?