Usually I set up the situation where the student and me are on one side and the problem we are facing is on the other.
.....It's hard sometimes to know whether to hold off with my stuff until the end, and risk losing them, or not doing anything with them, or ask about them at the beginning and then throwing the lesson off on a tangent (which it often does).
....I always read about what the teacher wants to do with a student, but I never hear about what happens when a student comes in burning with new stuff that came during the practice. Lately I've thought of just asking for an occasional extra lesson to deal with those things so that my regular lessons can stay on track with what my teacher had planned.