'97 Olds Achieva - car stereo removal

Hey everyone,

I have a 1997 Olds Achieva and I am considering installing my
Delphi XM Roady via the wired FM modulator. Basically, I just need to
pop the head unit out and switch the antenna wires around (yes, I
realize there is more to it, but that's not the issue). Two chain
stores have quoted me $70 for the installation, and a local store
quoted me $150.

I can't afford to pay that much for something that is so simple.
However, I'm a bit perplexed as to how the head unit comes out. Do I
need to disassemble a massive portion of the dash (as it would appear
at first glance) or is there a way to just expose the screws and pop
it out?

Any help would be greatly appreciated. Or, if you know a better place
to ask this question, that would be great, too. Thanks!

-Ben