Can't speak to the Headlights,
but I spent an Hour in a Parts Store Parking Lot (in Minnesota) last week, changing 2 tiny Tail-Light Bulbs because the 'engineer' thought it'd be good Idea to to put all 8 (yes EIGHT) rear lights in a single assembly and Mount it on the Trunk Lid
Not only did it require 7 nuts to be removed, but 4 of said nuts were recessed on 1"+ Bolts and could only be removed with a deep socket
Safe to say that who ever designs the average car puts absolutely No thought into any repairs that need to be made to it... (5 will get you Ten they all Lease..)