Apart from the exterior painting, the dining room was the biggest project we tackled by sheer virtue of its size. The fact that the wallpaper was underlay by a bright red paint did not make the prep work any easier.
There were a lot of issues in this room - maybe it was the most used? I don't know. But the plaster was in pretty bad shape, and there were dangling wires that we didn't know if they were live, or what they went to. We're still sorting that out.