Had to do it today. Site change. I'd changed a site this morning and at noon, had a high blood sugar even after a correction. No place to hide. Called fora security guard, waited and waited, none came. Finally figured out that I could lift my shirt and do it without disturbing the students. Wouldn't work if I was wearing a dress, but this one did.
Blood sugar is lower, though I think the heat in this room is part of the problem, it's over 100 degrees, and approaching hotter.