Unless you have amazingly tiny hands, you can't do it from the back (particularly Right side, UK driver side). Only other way is to take the whole headlamp unit out of the front of the vehicle. To do this you need a star-head screwdriver. Pop off 2 plastic covers on top of the headlamp and unscrew the 2 screws (easy). Then loosen off two lower screws: one visible down to centre of vehicle, one invisible down a 190mm deep hole towards side of vehicle. Then juggle lamp out of front, change bulb and replace. The long plastic stem used to change the side light snags on something as you change the Right side one (UK driver's side) and I sawed it off shorter. The Left (UK passenger side is easier. Good luck.
Quentin Shaw, February 2008