It depends, most of the time I just say "fudge" and move on. Make like Elsa and let it go... Sometimes though, if I'm under a deadline (like making a quilt for my grandma-in-law by June 1), if I force myself to continue, it works out, and I end up loving it! For those ones I'm hating, I find setting up the machine in front of the tv and binge watching netflix while chain piecing really helps speed the process along.
