I'll keep your suggestions in mind and will definitely post back what it took to get it done.
The video is on a M111 engine whereas mine is M112 where doing anything from the top doesn't look possible??!!
While I realize procedures can overlap between several models/engines, did you actually do this yourself on a 99 c280?
Ive only worked on a c230K. Anytime I purchase a used car, I check to see which models are DIY friendly.
Here's another link that should assist.
Try using the search engine, you'd be surprised the wealth of knowledge other members have posted here.
Read, read, read.... dont stop.