headliner with factory sunroof

need to drop my headliner to tighten up my sunroof.
headliner looks streched across not glued, question is
has any one droped their headliner with a sunroof, and how
hard is to restrech it,

it's glued. there's a headliner backer board, take off all upper trim pieces, and any other things attached through headliner (sunroof crank, overhead lights, soundbar, etc) and then slowly work the headliner down. there should be some metal tabs holding it up, plus some velcro. if your fabric is falling down, you can reglue it.