The proper painting of a room involves many steps .First, the room's walls must be cleaned by a mild detergent. This helps the paint to cover the surface better .Parts of woodwork and areas of the wall which you do not want painted should be covered with drop-cloths or with masking tape .Use a roller to apply the paint .This prevents streaking and makes the job go faster. Allow a sufficient time for the paint to dry before you put up any pictures.