I want to buy a new stereo for my car and don't want to pay for an install since I know how to get back there and pull my radio out and whatnot. But does it recquire a lot of special wiring such as splicing and routing this here and there or is it just plug n play. Like unclipping my previous stereo and clipping the new one in. (Wires wise, like those molex things or whatever they use). I'm rather savy with it but if it's splicing I don't want to incase I botch something.. thanks!