Originally Posted by MarthaVA

Try starching them heavily. Since you've already cut everything I don't think you can wash it now....so starch it and that will help with the moving of the fabric. And I mean HEAVY - many sprays and ironings. And don't push the fabric around - spray, then set the iron down on the square, then starch, set the iron down, repeat. Till its stiff. Then be VERY careful sewing.