I am currently in the process of renovating one of my rooms in my house. First thing first is removing the old woodchip wallpaper. Removal of the first layer of paint/wallpaper was easy, the last layer was a bit hard.
My guess is that the bottom layer includes the cohesive which is hard to remove. Using a waterspray and making the wall totally wet made for a world of difference. After 5-10 minutes of letting the wallpaper soak up the water, removal was much easier.
I could literally get under the wallpaper and scrape it off in chunks. The places where the wallpaper was still sticking to the wall, I simply added a bit more water and waited a few minutes.