I found these 2 articles which I think are pretty useful:
WHY AND HOW TO UPGRADE YOUR HEADLAMP CIRCUITS
The Headlamps FAQ
I'm really surprised PIAA doesn't have more instructional info on their site(especially considering their prices). KC has a FAQ site that's reasonably useful. Their instructions can certainly be used for other lighting installs. Hope these FAQs help, and thanks to those who wrote them.
Add any other lighting FAQs that you know about to this thread, then there will be a pretty comprehensive reference.
2001 Lariat SC 5.4 4x4 LS ORP Class III 17in wheels Captains seats Oxford White
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-PIAA 520 driving lights behind grill
-PIAA 1400 fogs in bumper intakes