You're in some senses managing an idiot savant, emphasis on the idiot part, except they're also a narcissist who will happily go out of scope if you let it.
If you have management experience, the analogy is immediately obvious. If you don't, I can see how having speed run learning it with a kid running around with dynamite would be taxing.
Many people hate when you don't anthropomorphize LLM though, but that is the best way to understand how they can fail so spectacularly in ways we would never expect a human to fail.
Interestingly, I have friends who aren't coders who use LLMs for various personal needs, and they run into the same kind of problems you are describing. 100% of the time, i've found that it's that they do not understand how to work with an LLM. Once i help them, they start getting better results. I do not have any need to anthropomorphize an LLM. I do however understand that I can use natural language to get quite complex and yes ACCURATE results from AI, IF i know what i'm doing and how to ask for it. It's just a tool, not a person.