I'm sure this has been covered before, but after doing a few quick searches I thought it might be easier just to ask.
I'm planning on replacing the stock radio with an aftermarket unit (as well as the speakers but I figured that out already). Is there a guide, preferably with photographs that anyone could recommend?
I'm comfortable with the electronic end of the upgrade, but I don't know how to pull the dash apart in a way that it could be put back together again

The last car I installed a stereo in was a 1970-something Pontiac Grandville Convertable so I'm a bit lost.
Thanks!