Hopefully, you have learned from our tutorials "Wallpaper Preparation" and "Wallpaper Basics" that wallpapering is, although a time-intensive task that requires focus, that it is also a fun job that beautifies a home. Those first two tutorials helped you through a room - now you're ready to go around corners and door and window openings.
When wallpapering, rounding corners and dealing with door and window openings is more complicated than simply laying strips across a flat wall. However, it is easier to employ a "Double Cutting" system and to understand that overlaps are necessary with your openings.
Unfortunately, you should keep in mind that in some older homes (and in some newer ones too!), there are rarely plumb corners as the house settles over time. This might have made your task harder since you can't depend on a plumb line for your corner. Double cutting your wallpaper (i.e. using overlaps) will help you negotiate these corners.