Originally Posted by PaperPrincess

You can try this. Sew 2 patches together, now just unsew them by clipping the stitches from one side or the other. Should be pretty easy to grab the stitches with your seam ripper. Now sew them together again, and this time set the seam. If you try and unpick the seam it will be more difficult because the thread has embedded itself into the fabric a bit.