To paint a wall with a roller, start at the top corner of the project area, where you have cut in a three-to four-inch wide area around the perimeter with a brush.
Working in a three-by-three area, roll a "W" onto the wall. This will help place an even distribution of paint onto the wall. Continue rolling from the top edge of the wall to the bottom, filling in the "W" as you go.
Repeat the "W" process until the entire wall is covered.