They’ll probably get better, but for now I can safely say I’ve spent more time building and tweaking prompts than getting helpful results.
Eventually you'll build up a somewhat reusable template you can use as a system prompt to guide it exactly how you want.
Basically, you get what you ask for, nothing else and nothing more. If you're unclear, it'll produce unclear outputs, if you didn't mention something, it'll do whatever with that. You have to be really, really explicit about everything.