DawoZedition....it is not that difficult if you are a DIY enthusiast..
Anyway I will try to make it as simple as possible.
The easiest way without removing the bumper is go to your left or right front wheel fender arch. Look inside , right behind the part facing the back of the headlights, is the black plastic guard covering. You will be able to see some screws attaching it to the front fender.
Remove the first 2-3 plastic screws carefully (so not break it) and pull open the plastic guard (with a flat head screw driver) towards the wheel. Dont worry about breaking the plastic guard as it is very flexible. As you pull open the guard, you can see the fog lamps at the bottom area of the bumper. Just turn the bulb socket and remove the bulb out and replace the bulb. I think the bulb is a HB3 (same as the high beam). After replacing it, just reverse yr steps and fix back the plastic guard.
Hopes this helps...