if you haven't seen them already, the faq's are a great place to start:
the other trick is to try to find similar cars--i want to say that your model year was something like 97-01?-- sadly, my brother has a '96 grand prix(or is it a grand am? can't remember)-- the model year right before yours, but they happened to change everything...
overall, with the gm cars i have worked on--i doubt you will be able to fit a netbook in the radio area without some extreme modification.
most of gm's cars(i have worked on a '94 z26 beretta, standard beretta, '96 grand am/prix, and 2000something camero) have a black plastic tub behind the radio that will barely allow a aftermarket radio to fit, and a netbook has larger dimensions then this-- you need to really mod this to get anything to fit, and then on some, the air duct work goes right behind the radio, so depth is further limited by this.
then there is the radio bezel-- it is 1.5din-- meaning that you can get a not-so-great 1 din flip-up screen, or mod a 7" screen to work-- i know some members have taken 7" lcd panels out of their housing, and managed to get it to fit with minimal modification in the gm openings..
for the bezel, i think it is 1 piece, but is not as bad as you might think-- they are typically held in place with metal snaps-- as soon as you try to pull it off, it should come easily-- just take your time.
for a better guide, try looking for a aftermarket radio replacement guide for your car--it will have the same principles.
and a junkyard is the best place to go for a replacement-- a dealer is going to want to charge large amounts of money for something like that...