It’s real easy to plead ignorance as a reason to not try something. I do it all the time. I’ve turned down jobs because I feel I don’t know enough about tech trends to write intelligently about them, and turned down music gigs because I didn’t know the songs.
Here’s the thing, though. Creating is a learning process. A writer is a perpetual student. A musician learns stuff on the fly. There’s a lot of flying by the seat of the pants when you’re an artist, entrepreneur, or problem solver.
If you know just half of what you think you should, that’s probably enough. Companies promote people with no management experience all the time. You’ll learn the rest by doing, by just getting into it up to your elbows, and growing from there.