Deluxe Remote

Car remote start, keyless entry, security system, difficult or not so bad?
I've been thinking of getting a starter Bulldog Security Deluxe car remote, keyless entry, security system package for my 2003 Ford Crown Victoria P71 (Police Interceptor). I sell police interceptors for public and for us, with trust with credit to finance those not so perfect switches motor install GPS in their cars (only for registration, customers know about them). My point is that I've installed several of these GPS systems switch and wondered if I already have a basic knowledge of electronics vehicle and know where they are the ignition wires on my car, how hard would it be for me to install this system in my car? They provide a Step-by-step DVD and manual, and also provide wiring diagrams for my vehicle on their website. I've heard of some people to install one in 2 hours, and other take days or even get finished, even with the tutorial.
If you are able to install a GPS switch then you should be quite familiar with the electrical ignition system of the type. It must be hard for you to remotstarterer and securitsystemem install a keyless entry and
Ham Radio Deluxe Remote Tutorial Part #1