I second flyromeo3 answer!

Installing a remote starter is not a simple task. Stereo wiring is much simpler.

You need to figure out how the logic of your ignition switch works meaning if it cut ignition 2 when crancking the starter. That alone is not a simple task and when you add the immobilizer bypass unit installation is a job to be left to a professional that deals with these kind of things on a daily basis.

Put your more valuable time into other more importent things and pay a professional to install your remote starter.

Here are some examples of what I had to go through when I installed mine. That being said, I have a long background in Automation and control.

I wanted my setup to be bypassed incase of a problem. One power harness that I can disconnect at any given moment and be back to normal operation with no remote starter.

1) On my 99 Accord EX-V6 I have two ignition wires that one will cut out when starter crank. Otherwise you will have an ABS system problems. If not done right you will also have a transmission control problem potentialy cause the check engine light to come on.

2)Bypass module was tricky, just to get the RF ring around the ignition switch.

3)Factory alarm disarm took a while to open driver door and run a wire to remote starter.

OK Enough.

You see, it is not a trivial task and you really can get stuck. You need an electrical schematics for your car before you even begin thinking about wiring your car up.