answer to most of your questions are stop being a girl
1 they pull out, try harder
2 they have screws in iirc
3 they pull off they have clips at the top yank them out a tad and stick your head in there you will see the clips you just push them
4 pull harder
Some of the plastic clips come out a lot easier if the screws are loosened half-way and then pulled out.
An old forum friend who works in Renualt service told me that about 2 years ago.
Get an RS roof lol :clown: