Before you begin any preparation or decoration work, it’s best to clear the room as much as you can. Move any items that need to stay into the centre of the room and cover them with dust sheets. Use dust sheets to protect the floor, too.
It’s also a wise move to soak the paper on the wall with hot water, as this makes it much easier to remove. You’ll find the water soaks in more easily if you cut the paper first by scoring it with the blade of a stripping knife, or you could run an orbital scorer over the surface. But make sure your stepladder is stable when you’re tackling the higher sections.