. . . a museum tour guide.
I used this analogy when writing my very first personal statement about being a teacher. I still love it to this day!
A museum tour guide is a great source of knowledge, but knows that the tourists will learn more if they experience it for themselves.
The tour guide will lead the tourists through the museum, making sure they experience the exhibits in an appropriate order and experience the most important things.
The guide will answer questions and lead tourists to ways of finding the answers to their questions on their own, when appropriate.
The tourists will leave having learned a lot of information, but also having had enjoyed themselves, experienced new things, and made connections with others along the way.