Oops, I Goofed
The two most common mistakes in foundation piecing are not cutting your fabric large enough to cover the next section, and putting a right and wrong side of fabric together. To unstitch a seam, slide the point of your seam ripper flat along the stitches. Cut a few along the seam every 1/2" or so, pulling out the ones in between. This will keep the paper from ripping. Press your fabric open fully so that tucks don’t form. Having a small ironing mat and rotary cutter on your sewing table will make your piecing quicker and easier.