You'll have to break out that seam ripper at one time or another. Make sure you use this handy tool with minimum damage to your fabric and learn quick ways to get the job done so you can get back to sewing.
Seam Ripper
Tag: fix seam
Repair a Damaged Seam
Repair those damaged seams with some easy hand sewing methods to make your items good as new. This video demonstrates two different methods depending on whether or not you have access to the inside of the seam.