Prepare the surface by scrapping the existing paint. Prime (with a primer) or whitewash the surface. Fill the holes with spackle or the likes or others. Sand the filled holes with wallpaper until smooth.
Cover the floor with newspaper, cardboard or drop cloth (to protect the floor) and tape the same down to keep it from sliding. Also always keep the work area well ventilated. Use roller on large areas such as walls and ceilings; the brush for small areas such as moldings, windows, doors and cutting along the corners and edges of walls and ceilings.
When faced with painting the walls and ceiling, begin with the ceiling. Water based paints are less messy (for easier cleanup) and emits less toxic fumes.
Paint brush the edges of the room first. Roll (with roller) the paint in a criss-cross pattern, overlapping roller strokes for an even finish during the painting.
2 to 3 coats of paint are usually adequate.
Start painting the walls by cutting in around the edges and the corners. Continue to apply the paint in a criss-cross pattern overlapping for an even finish. Use 2 to 3 coats of paint as necessary.
An angled brush can be used or utilized to paint woodwork, molding, doors, and windows.
At the mullions on windows or French doors the paint will slightly overlap the glass (the extra paint can be removed with a razor blade after it has served completely). Clean the paint brushes completely at the end of painting job or work to maintain their longevity.
Furthermore, when on break or lunch or any stop in between the painting work or brief interference before resumance later, wrap the paint-soaked brush in plastic until ready to begin again or later.