Some modern wallpapers are designed to be 'dry-strippable', meaning they can be peeled off without soaking or steaming.

Test a Corner: Try lifting a bottom corner or seam of the wallpaper with a putty knife or your fingernail.
Peel Slowly: If it starts to peel off easily in a relatively large sheet, continue pulling slowly and steadily at a low angle (close to the wall).
If It Tears: If it tears frequently or only the top layer comes off (leaving the backing), it's likely not dry-strippable, and you'll need to use methods from Solution 1 or 2.
Even if dry-strippable, some adhesive residue might remain, requiring washing (Solution 1, Step 7).

N/A - The easiest removal method, but only works if the specific type of wallpaper allows it.

Peel Off Dry-Strippable Wallpaper