Hi, Barb. We have answered this a time or 2 but unfortunately our deathless prose eventually gets lost in the ether of cyberspace. Just for the heck of it, I tried searching for this and actually didn't find much. You can check "wallpaper directly on gyprock" posted by Nancy on 8/31 and "wallpaper removal" posted by Lauren P on 9/22. There is an answer in the FAQ library also.
The good news to your particular situation is that there are some solutions sold for sizing the drywall that leave little evidence of their application. The bad news is that there really might not be a sealer there. You will need a "paper tiger", possibly a remover liquid like DIF or Dissolve, a couple of big sponges, a putty knife and a bunch of plastic bags. All of these are available from your home center. Some people like the chemical removers but we have found that white vinegar and water works just as well and hot water works better than cold.
First, run the paper tiger around pressing just hard enough to go thru the paper. Then sponge on the remover liquid, gently remove the paper with the putty knife, wash any remaining glue off and put the old paper in the trash bags. If you get lucky, you will have no trouble removing the paper. If the wallboard paper comes off too, there is not much you can do about it other than trying another remover liquid and varying the amount of water you use. If worst comes to worst, check wallpaper removal disaster posted by Beth on 9/7. But I really wish you--