It's not that hard to do, all you need is 2 relays and some wire, soldering iron, shrink wrap, female spade connectors and time.
First thing you need to do is cut the plugs off the headlight harness at the lights leaving enough wire to work with on the plug side. DO NOT CUT THE GROUND WIRE.
Next find a spot to mount the relays and run the wire from the battery to the relays. One relay will be for your low beams and the other for the high beams.
There will be 4 points on each relay 1 will be for the power from your headlight switch to activate the relay. Another will go to ground. The last 2 will be from the battery and to the headlight.
I found these on off-road.com and they use a set of 5 point relays.....
I hope this helps, I thought I had a diagram of what I did with the Mazda but I can't find it right now. If I find it I will post it or just make a new one.