No doubt steam is the best way to remove paper. When you rent a steamer also rent a perforator to put pin holes in the paper. The secret is to take off one layer at a time. Some layers can be peeled off by hand if you get the temperature and amount of steam just right. Remember the last layer is the most important due to removal of all the glue on the surface to be painted. There are two ways of doing this. The first is to remove the last layer of paper and then go back and steam the glue to the point where it can be easily taken off with a 4" flexible putty knife. Then take a clean sponge and wipe off any residual while the glue is still warm. The second method is to steam the last layer of paper and the glue at the same time. I prefer this treatment whenever possible. Keep the steamer on the wall long enough so the glue is well steamed. Then slide the pan down to the next spot to be steamed. Meanwhile remove the paper and then the glue from the area above with the putty knife. Work with another person and have them keep rinsing and handing you clean sponges to wipe off the residual glue. Keep repeating the process untill all is removed. Remember to remove paper and glue from top to bottom. Also after everything is removed you can do a final rinse with warm water and chemical. Besure to rinse with a clean sponge again. You now have the perfect surface to paint on. If you are going to repaper you won't need a final rinse. The glue will stick fine.