How to Hang Prepasted Wallpaper. Don’t be stymied by tough-to-match patterns, slippery seams and out-of-plumb corners. We&#x27;ll show you how to handle them with ease. Successfully wallpaper a room even if you haven&#x27;t done it before. A professional paperhanger demonstrates every technique you&#x27;ll need, start to finish, and shows you how to save time and avoid a heap of frustration.