There's no magic for removing wallpaper. You can "score" the paper with a Tiger scoring tool although sometimes that's not necessary. Then it's just a process of wetting and rewetting the paper til you can get it to come off. The "scoring" allows the water to penetrate the paper and reactivate the paste so the paper releases from the wall. If you are lucky, you can actually pull off the vinyl coating of the paper without water........this will leave the paper backing of the wallpaper on the wall. Then you wet and rewet the paper and usually it comes off in big sheets if you keep the paper wet for 20 to 30 minutes.
No matter what, it's a process that requires lots and lots of patience. You have to let the water work. Hot or warm water in a garden sprayer is one way to keep wetting the paper. You can use a paint roller loaded up with hot water and roll the water onto the paper. I have even used an old Wagner paint sprayer to spray a light mist onto the paper over and over.
For really stubborn areas, wet the paper and apply some saran wrap or thin plastic to the wall to seal in the water and let it work.