Not too difficult.
Remove the black fender liner underneath that side of the car (4 screws and 2-3 pop tabs in the wheel well).
Pull it back so that you can get underneath. Remove the wiring plug that plugs into the light. Then twist the entire assembly a 1/4 turn to the left and pull out.
The bulb is held into a connector piece, so you have to pull the bulb apart from the connector and then insert the new one in.
The bulb size is H1.
Insert the whole assembly back into the reflector housing and twist to the right until it clicks into place. Plug the harness back in and re-attach the black fender liner.
I think that only works when you are shorter than 5 feet. Otherwise I suggest you to take the bumper off, or the wheel.