I am lucky enough to have a ping pong table. For a large quilt I just take the net off and spread my layers out. I safety pin baste. If it is a bed size quilt I roll my office chair up to the edge and start basting. I then roll the basted sections until it gets to balky to reach over and then I rotate the sandwhich to facilitate reaching the other side. I have done king size quilts this way. You can also drape the layers over your cutting or ironing set up if it is wide enough and work the same way. Even when I could get down on the floor I never did.