The main way I make my sandwich is a process similar to ironing sheets. I work from the center out. I start by laying down the batting and ironing the front to the batting. Then I lift and spray baste. I move the quilt and batting around until I have the top totally spray basted to the batting. Then I trim the batting to within 3 inches of the side. I then repeat the process with the back. In the end, I will pin at least once per block just for extra security. I detest the process but it does iron out wrinkles front and back.