It is a tedious chore, but here is what I remember.
bike on kickstand, bars turned left
reach in from right side to unplug connector to back of bulb--if it is the first time off, it may be a pain. don't destroy anything, but be persistent
once unplugged, remove spring clip that holds backing of light in--this is where I buggered mine. clip has two ears that need to be pushed toward each other to allow swinging clip to pop out EASILY
if you are using force or want to use tools, you are probably doing it wrong.
get some GOOD light under there and be gentle. once it is out, you will say 'oh, that's no big deal"
Clip that holds light in will pop from its catch on right side of bike. clip is hinged on left side. clip works like some windshield wiper insert end clips OR some womens' hair clips. hard to describe, but once figured out, you can do it with your eyes closed.