You won't believe how easy this is... Go to any store where they sell wallpaper supplies, etc. Home Depot will do, too. Buy the tool to score the wallpaper. It looks like a mini pizza cutter but with spikes on it. Run this up and down and all around the wall. Then take windshield washer fluid, the blue kind (which is unbelievable cheaper than wallpaper removal liquid sold commercially). Put it in a spray bottle and spray the wall in sections. Once a section has been sprayed, slowly peel off the wallpaper. The small bits that are left can be lightly scraped off with a squeegie or any other scaping tool. The liquid works much better and costs less than the rental of a steamer. And your home won't get all humid and steamy.
You should always give the wall a rinse with fresh warm water to remove any excess glue.
I am my source: Diva Decors ReDesigner