Here is how I do my sandwiching---no matter how large the quilt is I use my table. I use binder clips, I first start with the table, and find the middle. and put a toothpick on it--I tape it down so it doesn't move. Then I fold the backing in quarters so I have the middle. I then put the center of the backing on the toothpick, I smooth it all so it is even all 4 directions. I then use my binder clips and attach it to the table---I use one of those tables with collapsible legs (like you get at office depot--but not the plastic top kind). I then do the same with the batting, smoothing it out, then moving the clips to include the batting, and backing, then repeat for the top. Then I pin it all that is on the top of the table. I then move it so I smooth it all and pin til it is all done. I have found that if I pin at least once every 4-5 inches in all directions it helps bunches. I use a domestic machine to do my quilting.