Yes, very fiddly. I've done the driver side, right looking forward twice, never had to do the left one at the battery. To get the cover off push it in, towards the front, then flick up the clip on top. then twist it around to vertical to get it out.
To release the light bulb clip push the middle of the wire, at the outside of the car, in towards the front, then fiddle it up and down until you find the slot to let it pop out. The bulb will then come out easily.
When putting back on the cover, again very fiddly, get the two extender bits into their holes first at the bottom, then push it at the top towards the lamp, then get the clip back over it. Luckily my fingers are not too big.
Hope this helps
vj, March 2015