How can you change a 2004 Renault megane front headlight bulb?

Very difficult unless you have very small hands. You need to remove the round plastic cover under the wheel arch by turning it anticlockwise, after turning the steering into a full lock. You then put your hand through the hole, remove another plastic cover, remove the headlight and replace it with the new one. You repeat the same thing on the other side if you are changing both. Dont forget to replace the plastic covers. I would recommend you buy the bulbs from Halfords and pay the extra to have it fitted.... It is well worth it!