It's a good example of “You don't know what you don't know.”
Until I had participated in the simulations, I really didn't understand some of the very small things that can have big consequences for how it operates. I think it's absolutely essential to have a full on run-through. We have the procession and all the different things that would ordinarily happen. We experiment with all of them, and then afterwards, members who have taken part can stay on the line. The clerk is there in the chamber with a microphone, and we talk through what worked, what didn't and what we could tweak. Then we try it again the next time. I think it's essential.