If the walls are much darker than the wall paper it would be advisable to cross line the walls or put on a base coat of white emulsion to eliminate the risk of the colour showing through.
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Depends on the paper but I'd white over it first to be safe
A few older houses may have walls painted with calcimine or casein paint. This type of paint is water soluble, and it does not form a strong bond on the wall. Wallpaper applied over this paint will eventually peel off. ... You can also use a special glue size called wallpaper primer/sealer to prime the walls.
No need to white wash walls first
Yes this is possible either with 1200 linning paper or heavy detailed paper
In order to obtain an excellent end result, it is best to remove the old coating from the walls, carefully preparing their surface for pasting.The emulsion coating is perfectly washed off the walls with hot water if the paint layer was thin.
Yes, but depending on the paper you have, thin or thick you may see some blue showing threw, especially if the paper is a whitish, cream Colour. Also the joins may be more noticeable, paint the walls white before 1-2 coats then paper. Or depending on condition of the wall it could be crosslined then papered
You can depending on the state of the paint although I would recommend removing the paint first to avoid any lifting of the paper, if this happened you would then have a much bigger job on your hands.
I advice to over paint it white beforehand
Yes it's fine to wallpaper over emulsion walls just a little bit of prep work, firstly lightly sand the wall with fine sandpaper then paint the wall thinly with the wallpaper paste
Well I would normally give it two coats of white emotion to tone the colour down