After cutting the squares according to the directions, draw a diagonal line on each of the smaller squares.
Carefully stitch on the line, or just the tinest bit to the right of the line
Chain pieceing saves time and thread
Instead of using your iron to push the corner piece over, lift the corner and match it up with the corner of the background square. Hold the corner in place and press with the iron. You'll get a lot less distortion this way.
After pressing, trim the seam to about a quarter of an inch.
Following the diagram, join the corner units to the corresponding solid square.
Press the seam toward the solid square.
Check to make sure this new unit measures 6 1/2 by 3 1/2
Piece two of these units together. The seams will interlock so you can match the intersection.
By removing the stitches of the vertical seam on the front and back of the intersection you'll be able to press the seams in opposite directions. This will make the intersection lay nice and flat.
Now sew the four-patches together in pairs, and then the pairs together to complete the block.
After you sew the last seam, again remove the vertical stitches to release the intersection so you can press the seams in opposite directions.
If all goes well, the block should measure 12 1/2 inches square.
Now give yourself a big pat-on-the-back and check back next month for tips on making the Saw Tooth Star block.