Fitting a microphone to the panel in the roof

Hi

I have a kenwood radio that I had in my last C4 (2005) and just bought another car (2009) and want to fit the microphone properly to the roof.

I have searched but cant find good instructions for what trim it is best to remove, or even how to remove the plastic around the roof lights where the mic goes.

Are there any good picture tutorials out there on how to run a mic cable from the back of the radio right up to the roof?

Any help appreciated!