sequence for painting walls and trim

A friend just closed on their new (old) home (800 miles away) and they will be painting the entire inside before they move in. Currently has stained trim which they will be painting. I would normally mask everything and then paint ceiling and then walls, but where the trim will be painted I would hate to come back and mask with tape on the freshly painted walls. Plus I assume the trim should be primed. Sequence and advice needed. Bud