Well... I've had my JDM black headlights since the Cotswold meet... and since they were gathering dust in the spare room, rather than wait for the dealer to fit them the next time it goes in.... I'd try it myself.. in time for Japfest....
I went and bought a socket set..
I got the arch liner moved successfully... and got through to the first two 10mm nuts...
.. and couldn't get them moving..., so I gave up in fear of shredding the nuts..