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Should take you 20 minutes max.
There are total of 7-8 screws to remove.
4 that are attached to your trunk, and another 3 or 4 which holds your CD changer to the bracket that are held by the previous 4 screws.
Then two blocks of wires connected to your CD changer should be a breeze.
With this DIY job, you'd be saving 80-100 dollars of ripoff by the dealer.