About 5 years ago I was approached by a very good friend. She had seen some of my work, and asked me to be her wedding photog. I HAD NOT done a single wedding up to this point, and was by no means a "professional" photographer. I told her so, and she said "Well, my Uncle Bob has a camera, so I guess we'll just have him shoot a few pictures". Quite, frankly, I KNEW I could shoot better than Uncle Bob, so I agreed. This bride wasn't planning on hiring a pro photog whether I said yes or no, she couldn't afford it.
I said Yes, and took A TON of photos. She enjoyed my work so much, that I have now shot her 3 sister's weddings, plus their family photos, and remaining children's senior portraits ever since.
A first time wedding photog can turn out a lot better pictures than NO PHOTOG! I say kudos, good luck, and have fun! I now shoot around 25 weddings a year, which isn't a ton, but I never would have known if I could or would like it if I hadn't given it a try!