If you are looking to actually de-amber headlights that are already considered the clear style headlight (2003 and 2004, which are clear on the outside but have amber inside), then try these pages. There is a lot of good information. I followed these instructions and it was not that hard. Take your time and you should be fine.
If you have the 1997-2002 headlights with amber on the outside, you cannot remove it. Some have tinted over it, or you can buy 2003-2004 headlights on Ebay.
Clear Lights
Instruction for Amber Lens removal