A little preparation shortens the job.
Clear the room
Move furniture out or wrap it. Take down fans, fixtures and smoke detectors, or cover them.
Pick the finish before the crew comes
Each of the options above leaves the ceiling in a different condition. Say which one you want, so the surface is ready for it.
Own and live in the house?
Resident owners of single-family houses may do this work themselves under the agency’s containment, wet-work and disposal rules. Rentals and condos are excluded, and the agency still suggests a certified contractor.