My first large size quilt using the Turning Twenty pattern, I cut blocks or borders too small, had to order more fabric online and then those dreaded shipping charges. I think my DH even gave me the sage advice "measure twice, cut once".
I have all the fabrics bought and ready for a Scrappy Christmas quilt just sitting-the directions are lousy! Even had my quilt mentor read, thankfully she agreed.
My other angst, I gifted a Warm Wishes baby size quilt. My top stitching was horrible, I used the wrong thread, the wrong color. I tried to coax it back in a trade for a Chevron that turned out really cute. I vowed to never force the quilting process when I am not in the zone and to never gift a quilt that I am not satisfied with.