I'll make it even easier
Get a plastic trim "spoon" Starting at the right corner, wedge it underneatch until it starts to come free. But your fingers underneatch and GENTLY free it from the friction buttons behind it. Do the same for the center piece. There are 2 screws on either side of the radio. Remove and relax. BTW, why add an "ugly" aftermarket.
Troll the for sale section or ebay, and buy one that fits for a lot less. Also buy the AUX adapter (like $50) and install it in the glovebox so you can plug in your iPod, MP3 player, iPhone or whatever.
Just my 2 cents....