Yes unfortunately the bumper does have to be removed. However my son removed mine in about 40 minutes. (But then he is a lot more nimble than me!).
Are Ring Xenon 200 bulbs road legal? (Or don't you care? 😀)
Have replaced my bulbs with Osram Night Breaker Lasers which claim 150% light. I am impressed by them. Only downside is shorter life.
I also suffered the 'droop'. bought a replacement unit on ebay but it arrived in the same state.
Might have used the same chap as mentioned by John above to replace adjusters. As I'm only 30 mins from him I took them there and he did them more or less as I waited. I'd already had them polished otherwise I think a polish was included in the price.
You can open the headlights yourself to replace them if you fancy putting them in your oven at a certain temperature for 20 minutes or so!