You're talking about the clutch MC, right?
Doesn't it use the same reservoir as the brake MC?
The reservoir doesn't have to be changed.
Some people have even recommended to remove the driver's seat but I didn't find this necessary.
To replace it, first remove the clip and clevis where the MC connects to the pedal.
Then remove the covers for the steering column and use a long 1/4" drive extension with a universal and hex socket. I don't remember what the hex size is.
Slide the extension in from the outside of the dash to remove the bolts.
Prime the MC before installing it.
The hardest part for me was bleeding the MC and Slave after the installation.
I ended up buying a vacuum bleeding kit. That was probably because I didn't adequately bleed the MC before installing it.
I don't have a sun roof so I can't answer your second question.