Hi
Removing the roof lining is easy when you know how.
I had to do this to replace my aerial when the mount broke on my

.
You will need to remove the sun visors with a Philips head, and the plate that they attach to. You will also need to remove the covers from the windscreen pillars, again these are Philips head. When you have removed all of these you should easily be able to see a long silver metal rod, which is attached to the roof mount. You should be able to pull this forward over the retaining mounts of the roof with your fingers, this will give you access to the aerial mounting area and you can replace the aerial. The refitting is in the opposite order. If you need to replace the cabling make sure you know the routing that it is going through, as there is limited access for you hands to get behind the consul.
I don't know it you can remove the aerial base without taking the lining out, also if you have a friendly breakers yard near buy try to do it on one of there cars first, I did, much better to wreck a wreck than yours on the thirst attempt
Hope this makes sense.
James