Total DIY virgin here so please be gentle with me.
Property I'm buying has (awful) wallpaper in several rooms. Its that woodchippy type style. One wall is badly damaged and will need stripping which I imagine will be a nightmare task and I'm then planning on wallpapering that wall. I've found some really nice wallpaper which I think would work quite well with the old (plain cream) paper and wondered whether I could just paint over the existing paper so I'd only have to strip and re-paper one wall.
New paper is for a'feature' wall effect and the background is very similar to existing if that makes sense and the coloured pattern in it would match very well with bedding, curtains etc.
Hope that makes sense?