You’ve probably heard that “Prep is everything” and it’s true. Properly preparing walls to receive either paint or wallpaper is essential. Unless the walls are already pristine, this will probably involve some degree of plastering, skim coating, sanding and sealing with a primer. If you plan to continue living in your residence while the work is going on, sealing off areas to prevent dust and fumes from spreading to unwanted areas can be demanding on the occupant. Closets may be sealed off so clothes and other items that will be needed during the work period should be removed beforehand. Dust containment is especially important in city apartments because often there is no cross-ventilation. Opening a door can create a suction effect, pulling dust into areas where the contractor isn’t working. Staying on top of dust by using zippered plastic is key. Using a reverse flow fan in a window is also helpful. Abe Lincoln once said if he had eight hours to cut down a tree, he’d spend six hours sharpening the axe.