2001 oldsmobile alero

I have a 2001 Alero with factory keyless entry. My question is Im wanting to install a Auto Command alarm with remote start. Will i need to disconnect the factory system to install the aftermarket alarm? I broke my alereo oem remote and im wanting a little bit more protection. The auto command states:     * Up to 1000ft. Range     * Warm up and defrost, or cool down your car by remote control     * Save Time and extend engine life by having your car all ready to go     * Car cannot be driven without your key     * Remote start relays on board     * Selectable run times     * low voltage check     * diesel mode     * quick stop option     * no-tach installation     * nuisance prevention circuitry NPC     * 3 zone alarm system     * alarm zone bypass     * passive/active arming     * starter disable     * auto rearm     * auxiliary output/trunk pop     * ignition controlled door locks     * daytime running lights     * parking light relays on board     * keyless entry outputs **** KEEP IN MIND it uses the factory horn and the siren and that this does not have a shock sensor **** I called around and my stero shops want 50-60 dollars and hour and they said 4 hours of work. I can do this myself with your help. Yall have helped me before. Can you guys help me with this one? I dont have 200 to spend getting this thing istalled. I dont have to have the remote start but it would be nice. I dont want to mess anything up.

give me your e-mail. ill send you a diagram for your car. if you have not already gotten a passlock bypass module for this vechicle do so. you will need it for the remote start therte is the xko1, the 457gw, there is the gmldp. directed , peripheral make these, also there is autopage they make some excellent ones too. the 457gw is still around even though they do not manufacture it no more.installers do it best. we got the magic hands!