Telling your manager “I’ve never done this before” on day one saves you from faking it on day thirty.

Admitting the gap early is cheap, because on day one nobody expects you to know anything. The cost rises with every shift you let it stand, until somebody discovers that a thing they relied on was never done properly. By then the problem is not your inexperience. It is the distance between what you said and what was true.

Make a short list of what you have not been shown yet, and ask about one item on your next shift. Ask for a demonstration, not a reassurance. People remember who asked early far more kindly than who was caught late.