Now you should have a one inch grid.
Carefully pin the three layers together. The reason for pinning is so that when you sew the three layers together, the layers will not shift.
Starting from the middle of the piece, you will sew all the three layers.
Take the first row of grid, and find the center / middle of the grid and fold it in half. Pin the layers together to prevent shifting during cutting in Step 7. A trick to finding where the middle of the grid is, is to fold it in half, and pin through all the layers on the stitch line. Then look on the other side of the quilt and to see if it close to the stitching line. If it is, you are good to go, if not, readjust according.
Using a sharp scissors cut a "V" shape starting from the middle of the grid to almost the corner. I leave an 1/8 inch gap between the cut and the stitching line. Do this through out the one inch grid.
You may want to cut 3 pieces of 1 inch piece of paper or scrap fabric and stack in on top of each other to do a test run before you cut through your piece.
The end result should be an "X" on each of the 1 inch grid.
Note that if you are using regular fabric (not Batik) fabric, your piece might be more frayed. If you like the fray look, keep brushing it gently in all directions.