Another trick I learned from reading these forums is to temporarily set the sheet on the frame with glue (wood glue, not CA), remove it, put more glue on both sides, set them apart until the glue dries, wet the sheeting after glue dries to make it flexible, then IRON the sheet on the frame with a monokote-type iron at high temp setting. That will stick it on instantly.
I think this idea is not incompatible with gluing the sheet to the leading edge first either. You could do both tricks.