Or you can spend the 25 bucks at your local pepboys, autozone, auto parts store and get the GM dash kit. Then spend 14 bucks on a haynes repair manual and Follow the instructions on dash removal given and do it yourself.
Or you can order through
www.crutchfield.com and they send you everything needed to install the deck into your car with a picture diagram showing all the hardware needed to remove the dash.
.. or you can pay upwards of 100 bucks to have someone else do it for you. Its your choice.