Im about to decorate my bedroom and wonder if anyone can help? I need to line all the walls first, they are plasterboard and when stripping the old wallpaper some of the surface of the board got scraped off. I am planning on vertically lining the walls. I then want to paint 3 walls and paper the fourth. I plan to use 1400 grade lining paper and wonder how to deal with the internal corners, do I overlap as with wallpaper, or will this make visible ridges because the lining paper is quite thick. also if I do overlap will it cause a problem with papering the feature wall because in the corners there would then be 3 layers of paper? Any ideas would be appreciated.