Good luck!! Mine is at lunch time right in the building I work at so it works out perfectly!!
You should maybe pick one and just go as a guest to see how you like it. I have become more comfortable speaking out loud in front of people since joining!
I think the biggest thing with public speaking is that you aren’t getting any response back like you would in a one on one conversation. It’s just you talking. I think that’s the part that makes me nervous!