REMOVAL
Peel & Stick
Relatively easy to remove the Eco peel and stick wallpaper could require some work.
Starting with a corner, grab a section and gently tug in a downwards direction, if you see the wallpaper is fighting you a bit, if you have access to a hairdryer gently run it over the wallpaper to melt the glue properties. This should make removal a little easier.
Depending on the quality of the paint used underneath you may get away with not having to fix the wall, although in some cases you may have to repaint or even scrub a sticky residue off the wall with hot soapy water.
Traditional
Use a scoring tool to create holes in the wallpaper. Use a spray bottle to soak the paper. Spray water into the slits so it can work its way behind the covering. Wait about 10 minutes and then scrape off the paper with a putty knife.