IF you can get the underdash wiring harness/relay from an EX coupe, its not that hard.....
You dont need to take out your harness, but you need the connectors off the other harness. I did it in my DX, very simple if you get the underdash harness.

I wouldnt know where to begin if you wanted to make your own wiring, but your going to need some relays and find power/ground sources.

GL and if you get the harness let me know, I'll give you some step-by-step info.....