Unfold the booked strip and position it against the wall so that its edge is against the marks you made when measuring. Having several marks allows you to place the wallpaper correctly as you move from ceiling to floor.
If you are placing the first strip at a corner, cut the top corner of the strip so that the wallpaper wraps around the corner without wrinkling. Place your palms flat on the wall and slide the strip into precise place. Use a smoothing brush or a large, dry sponge to smooth the wallpaper at the top of the strip.
Then, work the brush or sponge to smooth the wallpaper from the center, moving in both directions. As you smooth, look for bubbles and make sure the seams are flush with your measuring marks. At this point, if it needs to be repositioned, you can pull the strip away from the wall and place it again.
Trim the excess wallpaper at the ceiling and baseboard with a sharp razor knife. We recommend using a wide blade, made especially made for wallpapering, or an X-acto knife. If you have wallpapered the ceiling, crease the edge of the wall strip with a knife, and then trim along the crease with scissors to avoid punctures.
To hang wallpaper around electrical outlets and switches, remove the switch plate, turn off the power, and then hang the wallpaper over the outlet or switch. Make small diagonal cuts to cut out the area where the switch plate goes and trim back the edges with your xacto knife. Return the switch plates when the wallpaper is dry.