Good luck and thanks for what you do in your day job.
It’s been alluded to here already, but to reiterate.. Don’t sweat it over mistakes. My overwhelming memory of my first gig, some 35 years ago was the shock and relief at how much the audience (and even fellow band members) didn’t even notice my gaffs. Clearly that’s not your goal, but it might go some way to taking the pressure off, at least until you have your first few gigs under your belt.
Have fun and be sure to tell us all how it went 👍