I use the safety pin method also. I don't like the spray method. I place a half sheet of plywood (vertical half) on my ironing board. I spread out the backing, smooth out the batting, and then smooth out the front. I pin the part on the board. Then I move the center section to one side and repeat the process on one side and the far side. I can no longer get down on the floor to baste, so this is what I figured out. I have also basted on the wall as if the quilt parts were a design wall. That works for me, too.