If you are new to installing car alarms, you probably have noticed there is no specific manual to installing them for your car. Location is critical. Out of sight, yet not out of sound, shock or view. The easiest place for me to start was directly behind the battery and beyond.
The main unit goes greatly in most cars behind the glove box. Most factory installers put it on the drivers side. Running wires to the drivers side is quite easy and not too pricey. The trick is to keep the system on (especially if you have a paging system) and to think like a criminal (how is it possible to break into my own car).
Keep your sensors in locations that define what your sensor will detect. For example, Shock sensor. Mount it directly on a piece of metal inside the car. Don't even use double sided stick tape. Duct tape that bad boy on plastic to metal. You can always lower the sensitivity (or put some thick tape on) afterward if it goes off when you start your lawn mower.
The previous owner of my car had a factory guy do it, he put the shock sensor on the plastic steering wheel shaft and got his car stolen. Now that I've installed it, it does what it's supposed to do. Punch any part of the metal and it will trigger.
The glass breakage sensor would logically need to be located around glass that would break. Any small windows in the car, preferably on the drivers side, would be best. It detects a certain frequency.
Use your own judgment, you can do it. There is no reason to pay $100 an hour to have a foreign system installed in your car when you can do it yourself for free and gain knowledge and experience.