'65 Barracuda Headliner: First Things First?

Where do I begin with headliner installation? Is the first piece to put up going to be the side stainless (now painted white in my case) with the row of teeth? Or is there another window moulding or seal that precedes the toothy part? Thank you.

stainless for headliner.JPG

Headliner prep 1.JPG