Gather wallpaper, paste or adhesive, brush or roller, smoothing tool, utility knife, measuring tape, level, sponge, and ladder
Turn off power and remove outlet and switch covers
Clean the wall and let it dry completely
Repair holes, cracks, and uneven areas
Sand rough spots and wipe away dust
Apply primer or wallpaper sizing if needed
Measure the wall and cut wallpaper strips with extra length
Mark a vertical plumb line for the first strip
Apply paste to the wallpaper or wall, depending on wallpaper type
Fold pasted wallpaper gently if required and let it book for the recommended time
Position the first strip along the plumb line
Smooth from the center outward to remove air bubbles
Align each new strip to the previous strip with matching pattern
Butt seams together without overlapping unless the wallpaper requires it
Trim excess at the top and bottom with a sharp utility knife
Wipe off excess paste with a damp sponge
Repeat for all remaining strips
Cut around outlets, switches, corners, and edges carefully
Let the wallpaper dry fully before reinstalling covers or moving furniture