The rating doesn't matter as long as you follow directions. What I have found from working from magazines is make a test block first. Never ever cut it all up to the directions, then try to sew. You can waste a lot of fabric that way. Have extra fabric on hand. Always use a scant 1/4 inch. I also look for blocks that can be any size. Those are easier to me. In some patterns, the block has to end up a specific dimension to make the points or some other detail come out correct. In others, as long as you sew consistent seams, it works even if the block is 1/4 inch smaller than it is supposed to be. As long as they all are that way, it works.