Painting Dos

DO buy a quart first instead of a large quantity in case you're not committed to the color. Paint a piece of foam board and move it around the room to see how the light affects the color at different times of the day.

DO take the time to prep the area. Gather artwork and accessories in one box and place out of the way. Move furniture to the center of the space (or into another room altogether), wipe down walls and tape off molding. Cover the floor with a drop cloth, because plastic sheets can be slippery and mess.
DO remove all of the hardware — switchplates, doorknobs, drapery hardware, etc. — and place the parts in a plastic bag.

DO gather everything you'll need to get the job done and set up a "paint station" in or near the room. Include a paint tray, painters' tape, brushes, rollers, stir sticks, a paint can opener, rags, paint thinner, a screwdriver, hammer and ladder.

DO purchase one good paint tray and line it with inexpensive disposable plastic tray forms. Aluminum foil works well in a pinch.
DO calculate how much paint you'll need. It's always best to get it mixed at one time.
DO choose the appropriate rollers and brushes. Specific rollers are required depending on the paint's viscosity (i.e. how well it rolls onto the surface) and the wall's texture. Brushes with angled tips are best for painting on and around trim.