Nothing wrong with the answer, "I don't know."
All anyone really knows is their set-up, and their animals. One person can't have hands-on experience with everything.
That said, I'd be surprised if any of the questions you get are challenging. I'll bet most will absolutely basic. The hard part is actually fully answering a question from someone who has next to no base-line information to provide them with a context within which to understand the answer.