Update: Meeting finally happened at 11:30, because I said waiting was giving me an ulcer. All in all, not quite as bad as I thought it would be. I'm happy that I was able to smother my urges to (a) battle accusations with accusations, (b) try to lie my way out, and (c) just quit rather than deal with the problems. Instead, I just admitted wrongdoing and took the criticism. The least pleasant of all options, but I suppose the most adult.