how do i get the roof out off the car on a mercedes c280?

The roof liner? With BMWs I would lay the front seats down as far as they would go then remove through the rear door.

Removing the head rests may help some too.

well if you read the manual it says to remove the passenger front door and slide it out there. I am having to replace my headliner too and that sounded like a daunting task, I have decided to give it to the pros and let them worry about it.