they really are quite easy they must be trying it on with the lights out job, when you look at the back of the light you will see 2 rubber caps and 1 big plastic one, the plastic one is the xenon headlight bulb (nearest the wing) the bigger rubber cap is the full beam bulb and the smaller rubber cap contains the sidelights.
to swap the sidelight bulbs remove the small rubber cap and remember the bulbs arent facing forwards there pointing out sidewards towards the wings, try have a look to see the wires it may help to use a mirror. grab the wires and pull towards the middle of the car they may require a sharpish tug, id suggest startin with the passenger side as its easier to see and do hth