Installation is not very hard, but takes some time (16 or so wires to match up and splice). The old DIN radios used to be replaced -- and stolen -- on a routine basis when I was a kid, but not so much with modern cars.
The first trick is how to remove the old radio, and the mechanics of how the new one fits. These old radios typically came with a tool (a U shaped wire or a long flat "key") that would release the radio from the enclosure. The old one in my car, and the new, uses the long keys. One slides in on each side of the radio, they release the radio from two clamps at the sides, snap into place, then you pull them out and the radio comes along too.
