You are not along. Many people have problems with these, ask me how I know!!
The part is not too expensive as I recall, less than $15???
Not so hard to replace, I recall you just remove the headlight bucket/frame with 3 screws once the headlight is out and then install the new locking ring??
I recall there was a problem figuring out how to get the broken ring out due to the broke latch hanging on the frame, but got it sorted after playing with it.
Many people try to pry up on the release when you actually need to press the release down. Also sometimes the release will pop on top of the release frame and not allow the collar to rotate enough to release the headlight.
I have had to have the headlight bucket/frame out to replace the windshield washer pump as well, so I recall it is not too hard. 1/4" drive ratchet and sockets as I vaguely remember??