This headliner is driving me nuts

[dans67]

Hello folks, haven't been on here in a while, so hello again to all. Anyway, I'm close to finishing up this 53 that I've been working on, and the headliner is making me crazy. I got a new set at Carlisle last weekend, Looks decent, except for where the peak on the front got a little crushed in transit, just a stock style replacement. Anyway, I'm guessing that the front section should go in first, lined up with the sunvisor holes and tucked up under the door rubber, but should I put the center "S" channel on the headliner before I put the front section in the truck, or is struggling with the center section easier with the first piece in place? I had to trim about a quarter inch off of each side, it seemed to be way too wide to fit in the truck without bowing downward in the middle alot. I made 5 attempts at it today, lol, should have had breakfast first I guess, and left it alone before I accidentally broke something. Any pointers or suggestions?