I stopped in for a couple hours and watched some matches. I knew they were young, but didn't realize the were HS kids. I didn't see any real problems at all, and they seemed to take their jobs seriously, at least while I was there.
I know one other non-HS official was there officiating his first matches. He'd taken the time and made the effort the day before to watch the JV tournament matches from mat-side to get prepared for his debut the next day. That impressed me.