Actually, you can remove and replace the headlights without removing the grill.
There is just one bolt that is not easily accessible with the grill in place. You just need an extension of about 10-12" to access it from the top with the grill in place. You do have to finagle the pod a bit to get it out, as it's kind of a tight fit with the grill there, but it can be done, and the little bit of extra effort is well worth not having to remove the top fascia and grill IMO.
Getting it back in is a little more tricky. But notice that there is a "holder" for the bolt, so that the bolt does not need to come all the way out to remove the pod. Make sure that the bolt is in position when you put the pod back in, put your socket down from the top again, and there you go.
I recently had to move a ballast on one side because it was in the way of the vertical adjustment bolt. Total time to remove the headlight, remove the ballast, drill some new holes and relocate the ballast, put everything back together again, adjust the headlight, put all tools away etc, was under 40 minutes.