This is done a few centimeters from the wall.

A few words about the technique that is used when gluing wallpaper

The question always arises how to glue? Glue perpendicular to the ceiling, or perpendicular to the floor. If you glue perpendicular to the floor, you can use some simple devices. As a plumb line, you can use a rope that is tied to something heavy. Having fixed it at the ceiling, you should let the load freely hang on it. Thus, you will have a line (vertical). If there is no plumb line, then you can use the glue of the wallpaper soaked in glue. It should be hanged that he would be parallel to the wall. This is done a few centimeters from the wall. After — you need to press the wallpaper to the wall from the middle to the edges of the wallpaper in the direction from top to bottom.