it depends on what it is you are doing. if the complexity is low (frontend, GUI) you can just prompt it once and refine at the end.

if the complexity is high but you know how the task is to be done then what you can do is divide the task into pieces yourself or with the help of the LLM and use an LLM for each piece.

if the task is complex and you don't have a good idea how it is to be done then you need to start exploratory work with the LLM (multiple sessions, don't reuse the sessions for code).

how to use an LLM correctly is a skill in and of itself. the people who say that LLM's are bad either haven't used any good ones and have such disorganized thinking processes that they are unable to encode them into English good enough for an LLM.