'02 Accord LX security system factory self installation?

I just bought a new '02 Accord LX with and didnt buy the 700 factory security system. I figured since I could buy it myself online for 250 bucks I'd try the install myself. But before I attempt this, I wanted to know if anyone has done one before, any tips or should I just soend the money and let Honda do it for me. I'm mechanically inclined and have the tools plus instructions already.

Any help or comments are appreciated, many thanks.