People who know the ending can forget how uncertain the middle actually was.

Once you know how something turned out, the state of not knowing becomes almost impossible to recover. The path looks clear from the far end, the wrong turnings look obviously wrong, and everything genuinely uncertain has been quietly resolved by the outcome. Advice given from there sounds confident and describes a road nobody could see at the time.

When you give advice about something you came through, say what you did not know then and what you were afraid of. When you receive it, ask that question directly. The answer is usually more useful than the recommendation attached to it.