If you're lucky enough to be removing strippable wallpaper, simply use your utility knife or a fingernail to lift up one corner and pull the paper down the wall, keeping as close to the wall as possible to minimize the possibility of tearing.
If it appears you are not working with the strippable variety, you're probably dealing with a paper that you will have to soak, steam and cut;
For soaking: liquid paper remover or warm, soapy water and to scrape, use a 3 1/2-inch-wide wall scraper or putty knife with a flexible blade to begin stripping.
For steaming: You may need an electric steamer, which you can get from many tool rental locations, wallpaper outlets and hardware stores to rent.
Watch the video to see how it's done