Tough little situation you got there! From experience, I'd do the walls before you put the stairs in. There is nothing more frustrating than trying to wallpaper around stairs! Then again, I guess its obvious to say that you should take extra care while installing the stairs so that you won't...
Good job. This seems to be the complete house revamp. It’s really a vast project to take up and le me congratulate you and your boyfriend on successful completion of it.
I was having a similar problem to yours and these comments have been so helpful! Never thought wallpaper could give me nightmares until recently! The angles at the top of my walls aren't nearly as angled as yours, so good luck![/url]