I agree with ckcowl about trimming all your threads when making the quilt top. In high school Home Ec., our teacher was adamant about us clipping all our threads as we sewed. I think she may have instilled this particular step in sewing to me so much that when I've worked with groups of people, such as making crafts and craft items for our church's Holiday Fair, I would go a little nutso when I saw those loose threads; however, my friends still do talk to me. LOL. It's so much easier to clip those pesky threads as you are sewing, rather than putting in more time to do it after the quilt is assembled. I think I trim those loose threads out of habit that was instilled in me by my dear Home Ec. teacher, who taught me so much, she was also my mentor who helped me over some rough patches when I was in high school and college. I heard from a high school friend that she was still teaching into her 80's.