Did you sew the freezer paper into the seams or just iron it on the back of the center strip? If it's sewn in, put the locks together first so that pulling on the paper doesn't pull out the stitching on the seams. If it is just ironed on the back, you can remove it anytime you like. Just check your signatures to make sure none need to be traced over and heat set the ink on the blocks with a dry iron.