How do you change the right head light in a VWJetta?

I have a 91 Jetta and have experienced difficulty as well. There is a piece of black plastic in the way- I removed it and can now change the bulb with relative ease. I haven't noticed any problems with that part missing- .

Here is a link to a very detailed description. Not sure it applies to a '91, as it was written for a 2000.

http://mboedick.org/042/29/how-to-change-the-headlight-bulb-on-a-2000-Volkswagen-jetta-gls