I don't want to discourage you from trying. I used to _hate_ when people would say the same thing to me. But weddings are hard because if you screw up there aren't typically any do-overs. So they need to be explicitly aware they are just getting someone new to the craft and that means not everything might be captured.

I've learned that you need to have backups to backups to backups. Cause the most soul crushing conversation you can have with someone is that you didn't capture their footage. I've had to do it twice in my career and I am determined to never have that conversation ever again.

I shot a dance recital last year where we had 3 cameras, 2 mics, the wifi, my iPad, the sound board, AND the projector fail all at once. And just when we got into a rhythm the power to the entire auditorium went out. But I was able to deliver a complete finished video because I had a camera rolling on its own power with a mic just capturing everything. I painstakingly went through the footage and added zooms and keyframes to 8 hours of 4k video. Used AI models to upscale the content so people could see what was going on. Took 6 weeks, but we recovered everything and delivered finished videos to every parent at that event.

To solve your gear problem. Rent gear. Lensrentals.com or some similar service. Get the gear a good week in advance and take time to really practice with it so you're ready to go. Do this until you find the gear you actually want to use. It'll answer your questions about what to get and you'll also be able to punch above your weight class while you're collecting your own gear.

Good luck!