We have possibly the original wallpaper in our 1907 Denver Square entryway/stairway/upper hallway and want to replace it. It seems to be about three layers of paper with a textured, painted pattern. We have had three wallpaper hangers give estimates and all three gave us different opinions. The first guy said it all had to come down, but would be easy as it is paper and water would do the trick, but with all our old woodwork, it had to be done carefully to protect the wood. The second guy said if we took off the old wallpaper, our walls would crumble off so he suggested sanding the texture on the old paper, priming it and covering over it. The third guy said it absolutely had to come off and if the walls crumbled in places, they would have to be fixed and he wouldn't give an estimate at all, rather- he wanted to just be paid hourly. What to do?