The next step is to book the wallpaper in preparation for hanging it on the wall. Fold the two strips' ends over so that they meet in the middle of the strip. Be sure not to crease the paper. Then roll the strip loosely. Let it sit for 10 minutes.
Wetting sometimes causes the paper to expand slightly.
To apply the wallpaper strip, lift up the booked wallpaper by the top. The top will unfold. Smooth the paper along the length of the guideline and then smooth toward the opposite edge. Use the sponge to smooth out the wallpaper and to remove any extra paste. Use two pails of water, one for dirty water and one for clean, and change the water frequently while wallpapering.