Have you got your disguise worked out? What coffee and snacks will you have?
I assume you have a good camera with a monster telephoto lens?
Oh come on... everybody knows you need coffee and donuts on a stake out .
We were very happy with our agent, but I was curious about something that she could not tell me. Were the punters going from the other house to ours, or were they coming to see ours, and wandering over to the other house. This was quite important, knowing who was looking for real, and who was just looking due to the proximity of another house for sale. Generally, I would look at the house I was interested in first, and I wanted to see how this played out.
Secondly, when we were told 20 groups went through, I wanted to make sure it was 20 "groups" and not 20 "people" - ie. five families of four. That also is important in deciding whether to take early offers, discern how much interest there is, and what sort of people we were having go through.