Number plate bulbs- flat head screwdriver to gentle pull the whole light unit out (black case the lens is attached to) then gently remove the lens by releasing the clips on the side. Remove and replace bulb then replace lens and push whole unit back into place.
Indicators side repeaters- In same are as sidelights, unplug the wiring loom from back of the bulb then twist to release bulb. Put new bulb in and twist to secure then replace wiring loom.
Interior light - pull of plastic cover, pull out bulb, put in new bulb. If you struggle to get the bulb out you can take the whole light unit out and push it from behind.
With the 501 bulbs test them to make sure they turn on, if not just turn them around and they should work then.
I'm writing this from memory of doing it a while back so don't take my word for it and use it as a rough guide. I take no responsibility in any breakages.