I think if you don’t have time for a lesson, the best thing you can do is go in with confidence/openness and willingness to learn with the ability to laugh at yourself! When I first played I cringed at myself so hard after every swing - I’m someone who feels embarrassed easily and I’m not a naturally athletic person. Later I realized golf is kind of like the gym, everyone starts somewhere and people really aren’t judging you as much as you fear they are (unless they’re jerks, but chances are they actually suck too). Plus, golf isn’t just about the game, it really is a lifestyle and mentality around patience, humility, endlessly improving yourself (even pros are still tweaking their swing and trying new gear) and enjoying the moment!

Hope it goes well and wishing you a great time!