As OC says, Haynes details it quite well. May seem fiddly as you do it.
I had to replace the bulbs 3 years ago. Main problem I experienced was removing the heater panel from the fascia, because of the 3 heater control cables. I managed to twist the panel slightly to gain access to two fixing lugs, one of which then broke, but I did manage to remove the requisite holder to get to the bulbs. Sorry it's a bit vague, but it's 3 years ago!