Headliner Removal

I have used the search and still having no luck. I need to take the headliner either partway down or all the way down to install a roof mounted NMO antenna. I can't find any write ups or videos anywhere. I tried tonight and got all the hooks, grab handles, etc. off and it would barely move. Anybody have anything?

 

https://www.tacomaworld.com/threads/headliner-removal.472045/

A little bit of useful info but no start to finish instructions.
The dealership ended up replacing my headliner cause it was cut bad from the factory and was hanging down from the door seal.
Anyways they had a custom shop install the new one and now the whole center with the light for the back seats is sagging down. brought it back to the dealership and questioned them and at first they said it was normal to have that sag then I asked to look at another new Tacoma to compare. Sure enough it was up there solid as a rock. Now they are telling me it is supposed to be held up there with industrial teflon Velcro. I'm trying to get some clairification on that, so if you end up taking yours down let me know how it's attached.