There are three big tricks to doing headliners:
Make sure you first find the centerlines (fore and aft) of both the headliner and the roof, and mark them. Use the marks as reference points as you go, it ensures the liner is centered, square and will stay that way.
Anywhere it is folded, screwed, or glued in place it's vital to make sure there are no wrinkles or excess material.
Use a hairdryer to get out any minor wrinkles when you're done. Some cheaper headliners will always have wrinkles, the better ones won't.
Small rods on the back bow???