Well, imagine me... almost 71, up on that barn roof!
A big piece of the old, rusty tin blew off and needed to be nailed back in place. Neither my younger half-sister (62) nor her late-in-life daughter (23) would climb the ladder and get on the roof. Wimps.
Granted, the barn is quite old, and falling apart... but there is a workshop building inside the barn that I built 4-5 years ago that shouldn't get rained upon. It looks "finished" from inside it because it has sheetrock walls and ceiling, plywood flooring, windows, double doors, oodles of receptacles and even overhead lights. What it doesn't have is an exterior skin, nor insulation.
One of these days I may get to finish the exterior, but in the meantime it needs to not have a huge hole in the roof above it, else all my tools will be ruined. So it was DIY for this old broad!