The products that we have found very helpful are:
1. Wagner Steamer
3. Paint scrapers/spackle or putty knife
First we scored the walls using a wallpaper scorer. Second we steamed the paper to make it looser and easier to pull off. (We tried DIF, but didn't find it to be helpful, but we've heard others who used it and had much success) The extra holes allowed the steam to get through to the glue/backing layer and loosen some of it up. Then we used the scrapers to get under the paper as much as we could, and pulled off as much as possible.
Once the top layer was off we went back and steamed off the baking and layer of glue.
We were lucky enough to get 2 walls that came off in 2 big sheets just by pulling on the loose edges: