Replacing factory radio

["Kevin Abato" <delorean@xxxx>]

What is needed to replace the factory radio with a new one?

I was told that this is difficult to do, and if not done right, the original
radio can never be remounted. Are there step by step instructions out there
somewhere on how to do this?

Also, do I need any special hardware or mounting brackets to put in a new
radio? If so, where can I obtain them?