Draw a vertical pencil line on the wall surface at your chosen starting point. Check and recheck this line using a level (Image 1).
Pick up the "book" of folded paper and unfold the top section. Position it against the guide line (Image 2).
When you are happy that the paper is level, brush it down from the top and crease it into the junction (Image 3). At the same time, ensure that the vertical edge of the paper is precisely aligned with the pencil guide line.
Unfold the book and work your way down the wall to the floor or baseboard. Be careful not to crease or tear the paper. Keep checking that the sheet is vertical (Image 4).
Use the brush to smooth the paper over the wall and remove any bubbles. Work from the center of the paper to the edges (Image 5).
At floor level, use the brush to crease the paper into the junction between the wall and baseboard (Image 6).