Peregrin, nice choice of headlights for replacement. I'll be looking to do a set next year, I have my wife's retrofit to do first, as her car gets driven more than my X and I can't stand the halogens!
I'm assuming you have stock HID and will just be swapping your internals from your xenon lights? This projector will drop right in to the existing mounts if you want MUCH better light output, bolt it in and just aim it from there relative to the vehicle center line:
To open them up I used 230 for 20 mins in the oven, came open like butter. I didnt use extra butyl on the re-seal (although you can if you want to, not going to hurt), the key is to heat the housing up on the re-seal for another 230 at 20 mins to get the sealant really soft again, so it really closes well when you clamp it shut, make sure all cips engage, and leave some spring clamps around the top or bottom while it cools, you should have no problems.
However, I am not a fan of the 6000k HID, fact is it is significantly dimmer at night than our stock 4300k bulbs, add to the fact that most 6000k bulbs are aftermarket, and I'm afraid you will be suffering at night. Just my opinion, but I think eventually you will want 4300k back
EDIT: I just re-read your post and you are matching your fogs, which I understand, but just some food for thought, you can get probably 15% more light on the road if you go back to 4300k