Pinning the quilt (started this summer, last mentioned here in November, finished very recently), took a little more than four hours and seven hundred pins, which wasn't much considering I worried about how to do it for a month.
I was lucky enough to have a more quilt-experienced friend to advise me to move my furniture and tape the backing to the floor super-taut. I used high-tack blue masking tape to stretch it a bit at a time, then layered and smoothed the batting and the top into place.
I pinned starting near the center, then towards the margins in quadrants, a pin in each seam and corner, and more along the edge.
Anyway, that's it for now. Anyone struggling with how, exactly, a gigantic, room-sized quilt gets pinned together in the middle of the night before a preschooler can ix-nay the ork-way, now has a bit of a heads-up, complete with nighttime photos.
More soon! Thanks for reading.