My friend is getting married in a few weeks and she's asked me to be the official wedding cake cutter. I said "yes", but I've never done this before and I usually avoid weddings, so I haven't seen this done very often. What do I need? A couple of serrated knives? A pail of hot water to wipe the knife between cuts? I believe it'll be the stacked, round wedding cake variety. How big should the pieces be? I've looked at a couple of YouTube videos, but I'm hoping the Chowhounds have some advice for me. Should I be practicing this?