You need to bypass the theft system , wich is a little comlicated , mine take 4 hour to install (install in a shop) cost me 400$ can. And broke before the end of the first winter...crap
Theres a lot of stuff to bypass, and i wasnt able to open the trunk with the GM remote when the car was running on the remote starter.(at 1 feet it opened...)
Be sure someone will do it the right way, mine was not too good i think.
You can get it install at many place, just find the best deal for your need (or the need of your mother) ...distance...options...etc..