Wireless Security Alarm

I’m a pretty technical person, and I’ve been hooking up car stereos amps speakers compacitors and so on since I was 16. I’m 24 now, I also built computers for years overclocking and have networked one of the most elaborate home networks I’ve ever seen. I got all 4 of my computers talking, print server, flashed the firmware in a wireless router to create a wireless bridge and stream media from my media center computer through the Xbox 360. I’ve also worked as a web designer and coder. I’ve also have done some work on cars like alternators, serpentine belts, starters, brakes rotors, oil change.
I’m a do-it-your-selfer mostly because I’m broke.

I want to install a remote starter and car alarm system on my wife 2007 Suzuki Grand Vitara. I got a system like this installed on my car and few years back and it cost me (parts and labor) $380. I’ve reasearched and I’ve found an instructional dvd that seems pretty informative on this subject. I can find these remote start/alarm system on the net for around $100 and the dvd is $40.

I think I could hook one up myself, but I’ve just never done it before.
How hard is this to do? Based on my background do you think I could do this? I’m really looking for answer from people who has installed a system like this themselves