Then verify that the power is off by trying a light bulb in each lighting fixture, and a radio in each outlet, or by using a voltmeter to measure that there is no voltage at each point. You must be absolutely sure that each circuit has been deactivated before proceeding. The next step is to install environmental protection for the work area, and assemble worker protection gear for yourself and any other workers. If you are removing a wall with a painted plaster surface, you need to assume that the paint layers contain lead paint. All fabric items should be removed from the work area, including carpets.
Carpets can trap lead dust, which is difficult to remove completely by vacuuming.
Also remove all furniture, both to keep it clean and to give yourself room to maneuver in the work area. The work area should then be closed off from the rest of the house by taping heavy plastic sheeting over all doorways and entrances. You should make an airtight seal between the work area and the other areas of the house. A good choice of tape for this step is the blue masking tape from 3M, which can be used on painted surfaces, wallpaper, or woodwork, without damaging the surface when removed. All workers need protective gear, since demolition is a dirty, nasty job.