Repeat all previous steps. Ensure there's enough adhesive at the seams. Immediately remove excess adhesive with lukewarm water. Regularly refresh the bucket with clean lukewarm water.
Then trim the excess wallpaper at the ceiling, sidewall, and baseboard with a utility knife and your wallpaper spatula. Place the spatula against the wall at the edge and cut along the spatula. Keep your utility knife in place while moving the spatula. The spatula serves as your cutting guide. This way, you get a straight cut line and protect the wallpaper.
Also, read the other pages with tips on cutting wallpaper around windows and sockets.
Enjoy the process and even more the end result!