How Many Devices Are Going to Be Used?

How do you pick the AP and the antenna types and how many? Is it an art? Does it take a while to figure out? So a lot of that depends on the requirements. I always start with people, because most of the time, whoever I'm talking to doesn't even know what kind of devices. And then how many to put in, right? Because I'm thinking like a huge auditorium.I would have no idea, like is that a predictive software thing? Are you guys walking around with sticks and an auditorium?Because it seems like Blackmagic. Oh, yeah. It's just... It's the pipes for the internet, right?