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There are a few steps to take care of ahead of in between the scheduling call and the Glass fitting itself.
For starters, explorers are asked to set up Google+ accounts -- if they haven't already. (It might be shocking if someone in this program didn't already have one considering the test pool is made up of Google fanboys -- or at least tech nerds who are likely social media savvy and must have set up a Google+ account, even if it's not active anymore.)
The Google+ account is considered vital to the Glass experience because users can share photos and videos recorded on Glass with their Circles and "the world."
There isn't much else to do with Glass beyond sharing photos and videos yet, so users might as well comply.