On the whole I've found Haynes manuals to be worth the money except the
guide on installing Car Stereos/ICE, I bought many years ago. It
basically advised you to have a mug of coffee or tea before you started
any installation while reading the instructions supplied with your
stereo (with an illustration of a cup of coffee - handy) and to save
any magnets from ruined speakers to magnetise your screwdrivers in
future. Apart from some pictures of a stereo installed in a Ford
Fiesta, that was it! I was well skanked.