1. Take off the rubber cover covering the rear of the bulb
2. Unclip the wire bulb holder clip at the top, but leaving it on the hinge to hang
3. Get a thin and long shoe lace and tie it to the clip.
4. Secure the shoe lace to the front headlight casing with some gentle sticky tape
5. Unclip the hinge at the bottom of the wire clip, just squeeze it together at the base, the clip will pop off remaining tied to the shoe lace.
6. Pop out the old bulb and replace.
7. Get a small mirror and hold it in front of the rear of the bulb housing and reift the hinge at the bottom.
8. Once the bulb is secure - untie the shoe lace from the retaining clip and pop the top of the retaining clip back in place.

Sounds a little conveluted, but believe me when you do it, it is dead simple and takes less than five minutes and saves loads of work.