its not hard to remove those parts. if you get the factory manual you will see what steps need to be taken to do so. its all bolts and clips to remove the trim and such.
there may be some videos online showing removal of such parts, to give you an idea.
I got the headliner apart. But the satellite antenna did not fit my 07 qx56. Do u know a site, that sells white discounted antennas, that would fit my vehicle? Other than ebay, and Amazon?