Re: new owner dipped headlight bulb replacement
The bulb retaining spring should unclip from the top. You should find/feel two looped bits of wire at the top of the bulb mounting, push these forward (towards the lens) and then squeeze together this will unclip the spring from the fixing plate. It will then swing down out of the way and you can remove the bulb. Oh and remove the harness connector from the bulb before unclipping the spring.
Replace the bulb by locating the tab into the notch in the top of the reflector mounting, and then clip it in place using the spring. Make sure both sides of the spring clip back into place properly, then reconnect the harness connector.