Tow Bar electrics

[Jay D]

HI all, 

I bought my Q5 last week, has a towbar already fitted but it has 7 Pin electrics and prev owner had sensors turned off. I need 13 pin for caravan and it re programmed. been quoted just under £400 to do the whole job but I am capable of doing the wire loom change as from what I've researched its fairly plug and play. just wondered if anyone has done this to make sure it is fairly straight forward? I will then get a pro to re-programme it all, which is about £90.