Yeah, Mike, that's why I didn't want to get some large backing plate to go on my drill. Any larger than 3" or so, and I'd be worried I might hit the lip of the hood where it comes down to the lights. If I'm careful with a small backing plate/pad, I should be okay, as the headlights feature a rubbery trim all around the lenses, separating them from the hood and fenders.
I'll have a look at my local PepBoys for this, and for rubbing compound while I'm at it; they have the best selection of detailing stuff of all the local auto parts stores.