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.

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installers do it best. we got the magic hands!