how do I change out the stock radio to an after market radio on 1992 Mercedes-Benz 300TE

I know that I will need a special tool to get the radio out, so where do I get it or do retail stores have the tool when I take it to them to put a new radio in? What all do I need to remove to get the original radio out?

Asked by for the 1992 Mercedes-Benz 300TE
Most retail stores who offer radio installation have the tool, or you can stop by at a MB specialty shop and ask them to remove and disconnect it for you.