HL asked interior designer and design trend expert Michelle Trimborn from Design Quarters for her advice: "Before touching the wall or opening the protective covering of your wallpaper, make sure that you have finished any painting work you had planned for the room." "Are you painting the ceiling? Do that first. Papering it? Do the first wallpaper check, then paper this area first. First wallpaper check: make sure the rolls carry the same reference, shade, and batch numbers. Second wallpaper check: Check to do is colour: unroll a length of each and check one against the other in good natural light. Contact the supplier immediately if there is any doubt. First wall check: Check from top to bottom for any areas that may be crumbling, bulging or where there are holes. Fill all holes and cracks using a filler, smoothing down the surface when it is set. Seal porous surfaces with diluted Permabond." "Even with small holes and bumps flattened you need to check that the wall is generally level i.e. without ripples, waves and dips, or the wallpaper will highlight these. If this exists then unfortunately it is best to get a good plasterer in to supply a good quality, smooth, level plaster skim base. Allow a minimum of 7 days for drying time. Resolve any damp issues as well because the wallpaper won’t hide it for long." "If your walls have previously been gloss-painted or covered with any oil-based paint or sealer some wallpaper suppliers recommend applying a lining paper to give a more absorbent surface for your wallpaper to adhere to. Lastly, ensure the wall is dust-free, clean and dry." Have you got a particular question about a decor, food, or DIY issue? Email it to email@example.com and we’ll do our best to answer it!