First, I'll caution you not to use something like a "paper tiger". In my humble opinion, these things cause more damage than they're worth.
Try this expirement:
Take some really coarse sandpaper (50 or 80 grit) and give an 2'x2' area a really good sanding. Then wet it down with a trigger spray bottle. Be certain that the area stays wet for at least 10 minutes. Thrn try to remove the paper. ZIf you can get the paper off, then sand the whole wall thoroughly and use a garden type "Compression Sprayer" to wet areas only large enough to be stripped before it can dry out on you. It may help to add a couple of tablespoons of TSP to the water in the sprayer. One hint, TSP dissolves better in hot water.