Im installing sheetrock where outlets and switches are already installed. Ive seen lots of examples of how to easily locate cutout locations for installing drywall where the boxes are empty. However, for boxes that already have switches and/or outlets, is there a better way than measuring from the floor and from a nearby stud, in order to make the cutouts in the drywall?

 I SEEN A TOOL THAT WILL ATTACHE TO THE OUTLET AND WHEN YOU PLACE THE DRYHWALL UP TO THE ELECTRICAL BOX IT WILL PUNCH OUT THE CENTER OF THE BOX. SEEN THIS TOOL USED OWN THIS OLD HOUSE, ABOUT A YEAR AGO. NO SEEM TO HAVE THIS TOOL. HOME DEPOT , LOWELS, OUR ANY ELECTRICAL COMPANY THAT I HAVE CALLED. I LIVE IN THE ST. LOUIS  MO. AREA . I WOULD LIKE TO KNOW IF ANY MEMBER KNOWS WHERE I MIGT FIND THIS TOOL.

Another old thread brought up by spam.  But, what you can do is buy a  metal extension box.  Its a box with no back.  It mounts to the same screws the receptical mounts to.  All you have to do is loosen the mounting screws for a receptical and slide the box over the screws.  Place the drywall against it and tap it.  It will leave impressions on the back of the drywall. 

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learning how to texture. but dont know how to use a texture brush. someone please help.