I have done it and always regret it. By the time I get to the quilt, I have changed my mind about a pattern, or could use one of the fabrics for something else. Besides which, even after quilting for MANY years, I never cut out all the fabric for a quilt without doing a test block, or pieceing some of it first. That way, I'm sure the instructions are accurate and i like the way the fabrics work together.