I am an expert in what I teach. I must admit that I like being a facilitator or coach, but I do like having the knowledge of aiding the student when required. I can also show other ways of doing things when the students think they have mastered the material. Keep them learning at all times and show them that there is more than one way to skin... well, you know.
That being said, I do like challenging the students to figure out how to learn on their own more so than simply recalling or remembering what a teacher lectures.
A benefit I have noticed is that the students are forced to try.
The students response has been mixed. When confusion or frustration starts to reveal itself I use my expertise and guide them along the right path...