I have an ADT Safewatch A-710 system with three A900R keypads. I want to expand the system with a wireless system from Ademco. Can I integrate the wired and the wireless systems? Is this a job an "averaged skilled" homeowner can do? I have the schematics from the original wired system (4 zones). Can I use the existing key pads or do I need to get new "wireless" pads. Any advice is much appreciated. Thanks.