Lesson learned
I recently made Anita's Arrowheads and loved it. She is such an innovative thinker who has figured out new ways to construct blocks-and so very generously shared them- so if you just go slowly, forget your usual methods and follow hers step by step you will be amazed at how fast those blocks get done! PS-yes, you can pick out the stitches on the wrong corners and stitch the correct ones and it will be fine.