remote start for 99 cadillac sts

I want to put a remote start alarm on my car, but a few shops told me that i need 2 keys, 1 key to stay in the module.  I only have 1 key and cadillac and locksmiths want to charge over a $100 for another! Any ideas? Do i even need 2 keys?

How much do those modules cost?

Thats all gonna depend, are you doing the remote start yourself......if not, most shops wont work with a product they dont know...and if they do, they're gonna charge you extra for it. Your best bet is to check with the local shops and see who carries a module similar to this. To give you an idea on price, i found one on ebay for about 45. Anyway you look at it, its gonna cost ya.

Well theres a shop over here thats gonna charge me $40 for the module. How hard is an alarm to install? Im pretty handy with electronics but ive never even seen how theyre installed.Do you know od any how tos?

As long as you have a multimeter , some basic electrical knowledge, and patience you can do it. If you run across something you can't figure out....just post it on here and im sure someone will help.