That's my real name, too! So we have the same name and the same headlining on our R4s... it is retained on the front by the sun visor screws and at the rest of the roof panel circumference by a sheet metal "pocket". You should bend this open sufficiently enough to loosen the headlining trapped inside. (look at the drawing below to understand). Renault advices the use of a tool like this on the drawing, but any similar wide flat tool will do.
It is really a job of patience, I entrust it to my upholstery specialist usually.