Need some advice - wife had a garage door accident, and now I need to replace the shark fin antenna (which I already purchased). There’s also a very small dent in the roof that I think I can also take care of myself (stealership quoted $700 for everything). What I need help with is removing the rear portion of the headliner - I don’t see any clips or anything. I actually don’t need to completely remove it, just pull it down to get access to the nut securing the antenna. How do I do that? Thanks.