Hi! Author here: wow! One of the things I loved about the C64 was its immediacy and how you could just poke around and start breaking things. You just can't get that same effect with today's computers.
I can definitely agree with this. Even though I've only held a couple of individual training sessions, the worst ones are where nobody asks anything and people just leave. No feedback on whether this session was any good or did I just completely blew it.
I'll gladly hang around to address any questions. It shows that you're genuinely interested in the matter. Don't be afraid of coming across as a beginner either - asking questions is how you learn.