To prepare a bedroom for walls to be painted, remove as much furniture and objects from the room. You can leave the larger furniture in the center of the room, covered. Fill in any holes or cracks in the wall with a patch. Also, remove any hardware or outlet plates from the wall. Next, place masking tape at the base boards so you can paint below the carpet level. Tim suggests using a drop cloth rather than a plastic cloth to cover the floor. Drop cloths last much longer and are more convenient during the painting process. Make sure to lay the drop cloth neatly along the wall. Once this is all in order, you should be able to paint your walls without ruining your carpet and furniture!