No need to pull bumper. Just pull grill (three screws).
If going my preferred route (bar between front bumpstops/frame rails), that bar needs to be ~35"long, with 32.5" between the mounting holes. The "risers/extenders" need to go up ~10" and extend forward some 7-8" (depending on how deep lights you have).
I'll try to make a drawing and "conceptualize" my ideas. Been having this in my head far too long now. Time to share - and make it happen (since an ARB is likely not in the familiy budget this year, although some very sweet custom built front bumpers have surfaced lately on mud, i.e. Excile, ginericLC, etc), and the headlights are far from acceptable for highway driving. Need those Bosch lights mounted...
Only real drawback is that the lights will probably extend past the front bumper. Hence, have to be careful when pulling up close. Oh wait, that's another argument for going the ARB/custom route (need something sturdy to protect my expensive lights)...