There are some steps which are common. Like covering the furniture before starting work and cleaning the house at the end of the painting work. It's important that proper material is used for covering, so that existing furniture is not damaged. The usual painting process involves 1.Preparing the walls (making them even and smooth) with 1-2 coats of putty, 2. Applying primer for increasing life of paint, 3. Applying multiple layers of top coat (depends on the paint you used and the darkness needed).