Your top and backing should be pressed out as shown, prior to delivery for quilting. 

   

This is important as a backing with seams folded in one direction often pucker and leave a lumpy appearance. Also your selvages should be trimmed off before piecing the backing. If you use the selvages in the seams the backing may pucker and be out of shape along the seam.

 

One pressing tip that can make a world of difference is to press the long seams open. These are the seams that are made when you sew two rows of blocks together. If you press the long seams to one side, all the intersections with the blocks build up a thick wad of material, which can break a needle and cause a small tear in the fabric.

I can load the seam top to bottom, but this often makes rolling the quilt forward uneven as the seam in much thicker then the rest of the quilt, and can cause billowing of the backing fabric.

 

This is why it is important that your backing fabric is at least 5" longer on top, bottom and each side. Attaching the backing to the leaders takes up 4" of quilting space. If your backing is too short the quilt will not be quilted all the way to the bottom edge.

Again, this is why the backing needs to be larger than the top. If the sides are not at least 4" wider I am not able to put tension on the sides and there may be puckering on the back of the quilt.

The batting lays between the loaded top and backing on the leaders.

After the quilt is finished being quilted I unload it from the frame. At this point I would package your quilt up and send it back. If you want the quilt to be trimmed prior to shipping, please be sure to let me know, and see the pricing guide for trimming. I can also machine bind your quilt.