C'mon, I'm in my mid 60's, Hardly technically minded, and have installed Empegs in: Renault, MG, Audi, Hymer, only Range Rovers defeated me - I started doing my own installations long before Empegs, because I reckoned that I could do a better job than installers.
It's really not too difficult and, I don't know about the US, but here it's fairly easy to get the bits and pieces you need either locally or on the web: Two of those cars needed adaptor kits to fit a standard DIN unit in to a dash which normally has their own shaped unit.
You couldn't find anything more comprehensive than Tony's faq (I hope he never tires of the praise that's (rightly) heaped upon him) and if you get stuck, you can always post here.
Always bear in mind that the car that you are fitting it in to, one day you'll be taking it out of: So try and leave the wiring and fittings for the original HU in place.