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In all honesty, it's not an altogether daunting task to do yourself if you even a little handy. I have to say, that I've loved how easy that panels and parts of the C5 are to access for laying wires and whatnot. Perhaps others would disagree but it's been great for me!
There were some documents posted somewhere in these forums (4 pages) that had the factory installation instructions. I wouldn't recommend them only to look at for an idea as I thought they said too much to do something so simple making it look like far more work than the reality... Of course, don't all factory manuals?