Dont feel bad; I work in Audio Marketing for Sony, and I STILL fried my radio (and I am SUPPOSSED to know what I am doing!). Granted, it had nothing to do with the installation, but rather from trying to fix something else (I was replacing the rockers, and it started raining, so I used one of those blue tarps to cover the engine bay, and completely forgot that I had pulled out the rubber thing that protects the wire loom from bringing water into the dash, and because all the water from the tarp was runing onto the hood, it all ended up flowing on top of my stereo). Luckily, I got a new (better) stereo for free.
Felipe