There are many threads on this but it is easy as, if you have the correct connector, it is plug and play.

Failing that you can pick up all the feeds in the offside boot behind the trim
 
I have a diagram somewhere ,i made when doing mine, with the colour coding on it, i'll pm it you when i'm on the lappy;)
 
You will also need to replace the relay in the glovebox to activate the indicator tell tale on the dash
 

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