Try to do one room at a time so that you can enjoy the fruits of your labour incrementally! We bought our place 2.5 years ago and every room needed stripping back to the plaster (at least). I still haven't quite finished, but am getting there. It may seem like a mountain, but as you defeat each room the rewards are tremendous!

Wallpaper stripping and re-papering is the worst job - at least once you finish that the only way is up. Good luck and keep the faith!