Hopefully it goes well and you make some gains in skills and confidence. Just in case it goes wrong, a little story...
I had a lesson once when I was starting out, already playing out in bands and jams. It was from the guy I had learned the most from so far, by observation at his gigs.
It turned out he could play and demonstrate but had no idea how to teach. 25 years on, I am doing ok.
So if this lesson is a dud, don't be discouraged!