im looking to install a gps factory deck in to my vibe,,,my vibe obviously came with just the factory single disc am fm cd player,,,,i want to install the gps deck---i know i have to add the extra antenna which is easy but what else is involved???are the connectors on the back of the both decks exactly the same????do i just swap out the decks and add the antenna??is it that easy???please someone help!!has anbody done this b 4??