Do you have a long hallway, or a blank wall in a living room?? Put up something to protect the wall, then pin your backing to the top, it may have to go sideways on the wall.. Let gravity and smoothing bring the backing down nice, smooth, and tight.. . Pin it at the bottom.. next put your batting on, using the same method.. finally your top.. If you are spray basting, make sure you also protect the floor under the quilt.. I've done this several times and it works very well. Probably a tutorial on here someplace, maybe someone else knows where. That's what I'd do.