Reinstalling Factory Radio

[Liberty]

Hello all!
I have a 1982 C10 Silverado that has an aftermarket dual shaft radio installed. I'm slowly returning this truck to stock, so I purchased a Delco AM/FM Cassette Radio like the truck originally came with.

I haven't taken the old aftermarket radio out yet and I have no idea how to remove it or how to put the factory radio back in.

I was wondering if anyone here had experience reinstalling a factory radio and what I may need to look out for.
Thank you!