How to take the roofliner off

Anyone has got any tips? I need to do this myself as there is a leak from the sunroof drain pipe, the dealers labour is crazy for a pretty easy job like this, time consuming = expensive...

where do I start?
 
It requires removing a lot of the a,b,c pillar trim. Its fully explained in the workshop manual so I'd definitely recommend getting that. Available to gold members I think
 
think taking a head lining out is a pain in the arse tbh from talking to few ppl when someone wanted to change from cream to black fabric