I use my cutting table. I have one like they sell at JAF that the sides fold down. It's never collapsed, though! I also use the big office binder clips. I do the traditional backing fabric wrong side up; smooth and clip all around the edge of the table. Lay down batting, smooth and re-clip and same with the top. I do this regardless of quilt size. If it's big (and they usually are - it's rare that I make anything less than bed-size quilts), I center everything as best possible and start in the middle. When the center section of the quilt is all pinned or thread-basted, I then just slide the whole sandwich side to side/end to end until the entire piece is basted. It can be a bit tedious walking around the table that often but it beats the heck out of crawling around on the floor. Besides, I don't have that much open floor or wall space anywhere in the house to be able to do things differently.