I did my sidelights this way: Started on the drivers side, turned the steering all the way to the left first, removed the screw at 3 o'clock on the wheel arch liner & two lower bolts which are on the valance ~ got my Mrs to hold the arch liner back whilst I put my hand in & turned the sidelight bulb holder out. Then removed old bulb and put in the LED. Tested it worked, then put it all back together. Repeat for the opposite side with the steering turned the opposite way.
I don't have the biggest of hands though & it would have been a real pain without my Mrs holding the wheel arch liner back. Hope that helps.