It's nice when you realize you're improving. The little milestone I crossed wasn't really that big, but still exciting to me. I had to rethread the bobbin, and for the first time ever did not have to break out the sewing machine manual to read the steps. Also, when I dropped the bobbin back in to start sewing I didn't have to look at a diagram to see which way the thread spooled out. Hoo-ray.
OK. Continuing with the back panels. I laid the panels face-to-face, sewed them together at the center back, pressed the seam flat, then turned the panels right side out and stitched right near the edge of the center back seam.
I was a bit nervous about the channels because they are so long, and the panel so narrow, I had no wiggle room. But I took a breath, decided that after the threading breakthrough I was capable, and they came out OK.
I can't wait to see this corset from the inside when it's done.