I crawl around on the floor....but my days doing this are numbered.
I use blue painters tape to secure the backing, then sandwich it and pin.
I do get puckers. On a large quilt i start the quilting in the center and double check as I go.
smooth out and repin if I need to.
I am looking at the photo in this thread. I like this idea. Can you explain in some more detail how this stays on the wall. Is there a header? I think my DH would not be happy if I was putting pin holes in the walls.