Awww, thank you, ladies, for your encouragement and for sharing your own stories of nervousness and anxiety!
My MIL just left and we had a blast. I figured if I could get past the nerves, I'd be fine - and it was. :) We put together several practice blocks and I got half way through piecing a small rail fence lap quilt. I learned a lot, had a good time, and it felt good to be able to sew with someone else.
Much love to you all for your encouragement. :)