My rule of thumb: If the LLM is more junior than you, then go ahead and let it full autopilot. Check the results like you would check the result from a junior.
If the LLM is more senior than you, learn from it – treat it like a tutor and ask a lot of questions. Things like why we'd use MVP architecture instead of MVC. Ask until you have no dumb questions left. The hardest part of RTFM is often knowing which part of the manual to read and going through the what before the why. Ask the LLM to explain, then verify by searching it yourself.
LLMs will often pull the wrong language if you're not careful. Like contains() may function differently in different languages. This is where it's vital to RTFM.