Nobody pounces at the door. You'll be welcomed, pointed towards the show, and then left alone with it — which is the whole point of the place. If you want company, the team on the floor is genuinely happy to talk: about the work, the artists, what's coming next, or why that piece across the room is hung exactly where it is.
If you fall for something, the same conversation covers what happens next — no separate office, no formal process, no pressure. And if you just want to look quietly for an hour, that's a perfectly good way to spend an hour too.
The short version: arriving is the hard part, and it isn't even hard.