Being Prepared for a new class is very important.  because they can feel when the instructor is stumbling, or hesitating to find a fact or a piece of relative Information, that will help keep the flow and keep them stimulated.  not letting them dose off from the Learning at weakening pace or miss step. Must Prep at least 2 weeks before and be ready for the questions and answers that the students have. show that you care about them. 

I am so far Learning that Students will Look you in the eyes and Lie Just to say something. The patients you need and the need get their individual personal characteristics. then I can Focus on when they are starting to let my Instruction sink in. I really like when they get the aha moment, of discovery that know get it and retained it. I like now I have other students come to me and ask for an opinion, on the earlier discussions, or for advice.