I work by myself, so for me I cut in half the ceiling with a good angle brush- procede to roll. Continue this way around the room and then repeat. Also when cutting in and then painting, depends on how fast you work.
cut in -roll
cut in -roll
Your question? Do they always wash the walls , prime and then paint.
No, not on everywall do I clean,
No, not on every wall do I prime
Will dust
Just depends, each one will be different. Do a thourgh examination and try to get as much from the homeowner as possible.
If in doubt ----- prime it out.