I set ground rules. I let the group know that I expect us to begin and end on
time and that prior to lunch and prior to end of day we will have a QA session.
I ask every participant to jot down any questions they have and that bring them
up in the QA as they may find that they get the answer a bit further on as more
of the system is explained. During the actual exercise, I simply re-direct to my
lesson plan with something like "Great question! Let's be sure to talk about
that in QA."
By level setting expectations up front and then re-directing to task, everyone
knows what to expect.
Difficult end users, in my experience, don't know they are difficult. The
question-askers can bring their concerns to me at a time when I can answer
them- after the session or at the lunch break. In nine of ten cases, the person
was really just intimidated by the system and was fearful that changing would
impact their job performance. Off-topic issues go to the parking lot for later
resolution.
You'll be fine, Liz. Honest!