Ehhhh I have a hard enough time just deciding on what class is needed in a TF2 match.
Classes aren't picked. They're not real classes, just player roles. All players have the same access to the same weapons, items, and gameplay. By roles, I mean in terms of your team. One person could be an AWPer, AKA the sniper, one person could be a lurker, who fakes movement to a certain part of a map or tries to pick people off on rotation, one person is the entry fragger who's role is to be the first on a site and kill as many as possible/tries to get information, etc.
Like I said, everyone has the same access to everything, it's just a matter of how you use it.
Pretty much that moment when you fear that you know more than the 'expert'.
It's not as much a "fear" as much as she's the expert in that room, at that point.