While I have been quilting for 40+ years I still have trouble getting my piecing perfect. I just put together a top that will be quilted at the Senior Center. The original star blocks were made and donated by someone else. The fabric was to old to be able to match. I had to add enough other fabrics to make it queen size. I carefully measured and measured some more with every block I placed in the design. By the last row of blocks it is off a good inch in one row. I have ripped out, trimmed and resewn several times. It drives me crazy.