The only way to guarentee it sticking is to strip the paint off. See our paint stripping project. The adhesion between the new paper and the wall will only ever be as good as the adhesion between the paint and the wall. If there are any areas where the paint is not fully stuck, then neither will the paper be.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!