i got mine done by a member off here, very very cheaply...
i dont know what places are near you but i would only trust a big garage/renault specialist with all the equipment like tweeks or rentech or fred@yozzasport, so i would know its all right.... not sure how much though
yeah, theyre quite a drive for me too, it think fred is the closest specialist which is about 2 hours away, tweeks is about an hour but some of the guys there seem a bit, well dodgy.