Maxima 03

So i know theres a couple forums on this but none that give specifics. I wanna know what i need to do to swap out the old cloth seats. I want the heated seats living in the New England area. Ive read there is no relay nor did find one just a fuse. So my big question is, is the power seat plug gonna be a direct fit and is there gonna be a wire already installed and ran in the car. And what about the switch. How would i go about installing the switch for the heated seats. Any advise is greatly appreciated.