Replacing headlamps

[selkin76]

Replacing the bulbs in my 91 and I'm finding it a bit difficult. Can't seem to get the retaining ring to turn to lock the bulb in once I have the bulb properly placed. I changed one already and it was quite difficult to get the ring on. Any tricks to this?

Also, my passenger side headlight turns on when I have switch set to parking lights only. The driver side does come on once I turn switch all the way to the right. Not a major problem but I would like to fix it if I can.

Any ideas or a place to start trouble shooting would be appreciated.