Stripping wall paper using stripping solution, and or warm soapy water,
Firstly if it is vinyl paper you will have to score the surface to help the water absorb into the paper, similarly if the wall paper has been painted over, you
would also score the paper. One can do this using a sharp blade or edge of a filling knife, there is a special tool one can buy if you want. It is important to note when doing this, be careful you are only scoring the surface of the paper you do not want to mark the plaster underneath. Next damp down a section of the wall starting at the top and working down, ultimately you want to soak the paper but to spare your flooring you do it gradually, let the solution do the work repeat the damping process till the paper starts to lift, this may take time. When you are ready to strip the section you have soaked, wet another section beside the one you are stripping, then with a suitable scraper carefully start removing the paper; using a pushing motion along the surface of the wall. continue wetting the next section periodically so it will be ready for you when you have finished stripping the section you are on. Then continue this process till walls are stripped.
Stripping wallpaper using a steam stripper.
Always read safety instructions before using wall paper strippers, as they get hot and are dangerous!
Now again if you have a vinyl wallpaper or it has been painted over, you do as above score the paper with a blade. Using the same approach, you start at the top of the wall holding the now steaming plate against the wall, you will have to judge how long to hold it in the one place, it depends on the paper and the number of layers etc. Start with about 6 seconds, then move the plate to another section beside the one you want to strip, holding it against the wall while you strip the section you have steamed, moving the plate onwards steadily every 6 seconds or so, stripping behind it as you go, one constant motion if all is going well. Stripping wallpaper is a bit of an unknown, one never really knows how it will go until you start. It is important not to over heat any one section, as you can lift the skim plaster underneath, especially if there are cracks in the plasterwork.
In both cases above; wait until walls are dry before sanding smooth. Then they are ready to paper again or in this case lining paper was used and then the wall was painted. Use a drop cloth to protect your floors, if you have wooden floors in your room, make sure you tidy up as you go keeping the paper off the floor, because if sticky wall paper drys to your wooden floor it can be as hard to remove as from the wall!