I'm trying to replace my Vision's H4 bulbs with some Hella HB2 bulbs. I expected this to be a simple job, but it has become complicated. Perhaps someone knows how to make it simple again. - I removed the air filter as instructed in the owners manual - I pulled back the moisture boots. I still cannot see the back of the bulb, so I'm working from feel. - Here's where I run into problems...apparently I cannot figure out how to release the retaining clip. Without being able to see it, and with limited space, I hve tried every combination of pushing, pulling and rotating that I can...to no avail. Any hints? Lastly, If I have inadvertantly damaged a clip, how difficult is it to remove the entire headlight assembly?