Its not a difficult job to do even to a complete novice and im sure theres prob a guide on here if your struggling. I would rather let my girlfriend do the work than Nissan... well maybe but you see my point
My experience of Nissan went as follows:
Drive into garage
Walk to reception
Guy at reception (also mechanic) asks what car "that" is...
Thinking maybe it was due to the very massive changes that had thrown him, this being side skirts and a front lip, i said a 350z.... long pause followed by ohh im not sure we do those..
Got back in my car
Drive to Abbey in London, best service ever.