Μετάφραση - Αγγλικά-Λατινικά - you cannot be an expert at a job for which you have not done an apprenticeship

I think this is an expression, meaning something like "You have to crawl before you walk."

Note that this is a bridge translation to facilitate the Latin translation.

Du kann st nicht Meister sein eines Berufes, den du nicht erlernt hast