The first step to being able to remove wallpapers is to go out and buy a steamer. You can rent one if you want, but if you regularly remove wallpaper from your house, you might as well buy one.
You can also invest in some protective goggles and gloves, given the nature of the work you will be doing. At the same time, you will need to acquire a scraping tool as well.
First remove any pictures that are hanging on the walls, or any furniture that is lying about. Once this is done, go ahead and power up your steamer.
Some steamers come with varying instructions, so make sure you follow the ones given on the model that you have purchased or rented.
Ideally, once the water starts boiling, that is when you need to go on and start using the steamer. All you have to do, is take the steamer and place the pad on the top of the wallpaper strip. You need to hold it there for about 30 seconds, till you can see some darkening on the pad and its edges.
You can then slowly move the steamer and its pad to the bottom of the wallpaper as you repeat the process for the whole strip from top to bottom.
Once you have run your steamer all the way to the bottom, you need to get your scraping tool and peel away the wall paper from the corners. It may not be an easy remove job, which is why you may have to use your scraper to help peel away and remove the wallpaper completely.
At the same time, once the wallpaper comes off, there might be some adhesive left on the wall, which you can also remove using warm water, your scraper and some cleaning liquids.