The recent BA38 plane evacuation got me wondering again about how plane evacuations work.

Specifically, I'm wondering about those passengers who need assistance in boarding the aircraft. Do flight attendants know where they sit and assist them? Or is it just nearby passengers who usually pitch in to help? It seems like it would be difficult for some of the less mobile to get out the slides, though I don't know (thankfully!) how hard it is to maneuver out the slides.

Also curious about the pilots. Do they exit the cockpit and go out the slides in the passenger section? There's not an exit for them up there in the cockpit, is there?

And note, this is in reference to an instance like the BA38 evacuation, where the plane is not torn open or anything like that, and an exit down the slides is fairly (under the circumstances, anyway) feasible.