Cut a 36" length of nymo. Gently stretch it for a few seconds. This relaxes it and keeps it from stretching after it is sewn. Then draw the thread through some conditioner a couple times. I use thread heaven. It really reduces tangling.
Work 3 or 4 backstitches to anchor the thread, come up at your starting point, and pick up 4 seed beads. I have photo step by steps showing how the beads are stitched down. Stitch down the 4 beads along the design line. Stitch back up through the interfacing, coming up between the middle two beads. Run needle through last two beads, snug up the stitch and pick up 4 more beads. When you are through with a line or area, run a double thread through all lines of beads. Begin and end all threads with 3 or 4 back stitches.
Trim away the fabric even with the outer edge of beads. Be very careful to not cut threads. Leave some fabric at the end not sewn yet. I used a piece of 1/4" wide elastic for my loop. Stick the ends into the collar between the beads and the felt backing, and back stitch beads across the end.
Anchor your thread with 3 or 4 backstitches. Keeping thread on the back of the piece, pick up two seed beads. Arrange the beads side by side along the edge and stitch from front to back close to the edge. Bring the needle back up through the second bead. Snug the beads into place. Pick up another bead and stitch through the edge front to back and back up through the bead. Pull thread up close, but not too tight. When you get around to the starting bead, run your thread through the first bead and through the fabric from front to back. Secure stitching with back stitches.