Radio Removal

I did a quick search and came up with bupkis. Can someone tell me how to get my stock AM Radio out of the dash so I can install one of them new-fangled radio-thingys?

I have a 74 Duster AC car with the underdash vents. If I remove those vents, is the rest of it kinda cut-and-dry? How hard is it to get those vents out?

Sorry guys. I just like to know what I'm getting into before I dive in. I hate breaking 45-year-old plastic playing guessing games.

Thanks!