Choose your paint. Decide whether you want to use a darker shade of your existing color or a new color completely. If you decide to choose a new color, pick one that is represented in the room's decor.
Sand any of the areas of the wall that are not smooth.
Wipe down the wall with a dust rag to remove any dust. Mix 1 cup ammonia with a gallon of water. Soak a sponge in the mixture and wipe the walls clean with it.
Tape off the trim and any other areas you want to protect.
Open a can of primer. Stir the primer with a paint stick. Fill a paint tray with primer.
Roll a paint roller into the primer. Paint the entire wall with the primer. Use a small paintbrush for small areas, such as between the windows.
Allow the primer to dry for four hours or until it feels dry to the touch.
Open the paint and stir it with a paint stick.
Pour a half-gallon of colored paint into a clean paint tray and roll a clean roller in the paint.
Apply the paint to the wall in 2- or 3-foot square areas at a time. Roll the paint on in a zigzag pattern, like you are painting an M or W. Roll paint into the blank areas with vertical or horizontal strokes. Use a small brush for small areas that can't be reached with the roller.
Allow the paint to dry for four to eight hours or until it is no longer wet to the touch.
Apply a second coat of paint.