Installing a remote starter without cutting factory wires?

[yarisquacks]

I just bought a 2009 Yaris sedan without keyless entry, i failed to ask before we did all the paperwork at the dealer and assumed all cars with power locks and power windows came with keyless entry and alarm. I was very wrong. Well my question is who here has gotten an aftermarket alarm installed and what i need to know before they install! For example what they need to do and not do, just to avoid any problems with the warranty! Every place that i have called tells yes, no, maybe! I dont know what to do! Thats how i came across YARISworld! Please if any techs here have any suggestions please let me know! thanks in advance!