Be careful with the lights as you need to run the wires from one light feed and back to he return for that feed again or they will either turn on and not go off or they won't turn on at all

Been there done that

As for the switch, yes, you will need someone who knows what they are doing or else you will end up with a car fire

Not hating, just telling it like it is, I went through loads of grief trying to get my turbo timer wired up in my estate and the wires were so thick I couldn't screw the steering cowling back up again