I just did my install yesterday.The only real trick (and it is not too hard) is getting a wire from the inside to the front compartment/fog lights, I went thru the existing brake line grommet. I mounted the relay up front, so I only needed to bring one wire thru the front wall.
I used oem EDM foglight switch in an oem EDM switch bezel. A friend of mine went to europe and brought them back for me. I had a tough time trying to figure out the EDM switch, the switch I had had 6 pins, well a little time with an ohm meter and all is good. I wanted all of the factory switch lights working correctly. So I needed 5 pins, I also had to figure out how to get wire on the switch pins, (no connector) I used old computer power wiring harness (the power supply plug for a floppy drive worked great, just jad to file the sides and it fit, so then I only needed one more pin figured that out as well.