Just a few tips from someone who just removed his bumper and headlights:
-Bumper removal is pretty easy and straight forward if you follow the PDF instructions posted above. Don't be afraid to remove more screws from the fender liner than those instructions tell you to. I found it made things easier.
-Make sure you take the front wheels off first.
-Have a "torx 30" bit that fits on your socket wrench. Craftsman makes them and I got one at sears for my 3/8" drive socket wrench.
-when removing the headlights remove the headlight bracket that each of the headlights sit on. It will allow you to remove the headlights without having to try and remove the one almost impossible to get to screw that is directly under the headlight and connects it to the headlight bracket. It took me 2 hours to get that bolt out on the first headlight I did. On the second one I noticed I could just remove the whole bracket with the headlight and it took like 10 minutes instead!
'07 Porsche GT3
'06 Honda S2000 #555 TTC
'08 BMW M3(sold)