My housemate's stepdad recently bought a 2017 F150. A few weeks ago, he decided he wanted to change the high and low beams to something that was a higher intensity. He actually had to take off the plastic wheel well lining, to get to the bolts to take off some plastic trim around the headlight, and I think he also had to take off a piece of trim above the headlight, concealed by the hood as well. Then take the headlight cluster out.
I can't imagine what the labor rate would be on something like that, at the mechanic! but worse, the way the thing was designed, I remember one of the bulbs, when you went to put it in, met with some resistance, where it felt like if you turned it too hard, it would break something. He was having trouble figuring it out, and I tried to help him some. I told him he might want to look it up on Youtube and see if there was an actual video. I remembered a few years back, I had to replace something in one of the toilets at my new house. It's one of those fancy Kohler toilets, so everything's more complicated than it needs to be. Anyway, I remember this one part just twisted into place, but seemed like it would take so much effort that I'd break it first. Well, lo and behold, there was a Youtube video! And in the video, they even mentioned something along the lines of "even though it feels like it might break, twist it until it locks".
Anyway, rather than try looking up a video, he simply heard the "twist it until it locks" part of my advice. And did it, and, damn if it didn't work! Well, this time, at least. It does make me wonder though, what's going to happen, as that plastic headlight assembly ages and gets brittle? Headlights don't burn out like they used to, but I can imagine a scenario where, by the time it does burn out, the cluster gets broken trying to replace it, and then you're out Lord-knows how much money to replace that!
I know I've told this story before, but back in 2004, my Panther-loving friend bought a new passenger side headlight cluster for his '95 Grand Marquis. The existing one had gotten brittle, and not only fogged up somewhat, but actually had cracks in it. It was getting water in it, and retaining it, yet had cracks along the lower part. I jokingly said well maybe we should just drill a hole for the water to drain out, and see how long it lasts 
Anyway, he brought the car and the headlight cluster to me, figuring I'd know how to put it on. But, it was the first time I'd ever tried to deal with that type of headlight. Even though I had my 2000 Intrepid almost five years at that point, it hadn't had a headlight burn out yet. I couldn't figure it out, on his car. So, he ended up taking it to the dealer. In addition to the $225 he paid for the headlight cluster, they charged $75 to install it. I guess, on the plus side, it came with new bulbs! But essentially, $300 to replace that headlight cluster.
And then, within a month, he decided he wanted a newer car, so he traded that Grand Marquis on an '04 Crown Vic LX at CarMax, and they gave him all of $600 in trade! I'm sure he would've gotten the same $600, whether he'd replaced that headlight assembly or not. I also told him hell, I'd give him more than $600 for it, but he's one of those strict "never sell a used car to friends" type of people. That Grand Marquis had about 175,000 miles on it, smoked a bit on acceleration, and you could tell it was getting a bit tired, but it still had some life in it. It was also rusting a bit at that exposed seam at the top of the C-pillar, on both sides, but that could have been sanded and painted, at least. It wasn't that bad, yet.
Oh, and eventually I did have to replace a headlight bulb on my Intrepid. And was able to figure it out. It was just two REAAAALLLY long bolts that you had to take out, and then you could pull the cluster forward enough to get behind it and change the bulbs. I wonder if the Grand Marquis was similar?
