What you'll need: spray bottle, plain Dawn dish soap, white vinegar, a scraper, a sponge, and HOT water
Here's a before shot so you understand what was living down the hall from me.
First, we used Dawn and hot water in a spray bottle. Spray small sections of the border then wipe with a rag. Before it dries, use the scraper. Once you get a good piece started, start pulling. Repeat till done. This room took my husband about 2 hours.
Once he was done there was still areas of glue on the wall. This time I used hot water and vinegar in the spray bottle. Instead of spraying it on the wall, I just used a few sprays on a sponge. A little elbow grease and the glue came right off. Any normal human this would probably take about 30 minutes. This anemic pregnant woman it took about an hour.
As a whole, it was a whole heck of a lot easier than I expected. The end result: