There are instructions around but sorry, I don't have a link, also most instruction advise going through the wheel arch access hatch but on my LCI I found it easier going from the top (bonnet open). I did remove the wheel arch access hatches (don't need to take the wheels off) just because it gives a little more room for manoeuvre.
If your thinking up upgrading the headlight bulbs to Philips Extreme or OSRAM Night Breakers etc do it at the same time, just stick your hand down the back of the headlights & remove the 2 covers & the rest is fairly straightforward & obvious
: Check this out
, toward the bottom of the page post #19 by e90Liv