You can install the alarm yourself, but you WILL have to come visit us to have us activate it to your car. So that the motion sensor will be activated when you lock your vehicle. Otherwise, it won't blink. My friend tried to get around it, but afterawhile, gave up because he couldn't find a way around the activation.
My friend did it on his e46 325i, I don't know how, but somebody knows.
Good luck!