5. I then layed each curtain out and used a pen to mark 1.5" lines at even intervals. These mark the slits where you will thread the curtain onto the rod. In the photo below, the marks are hard to see, so I noted them with arrows.
6. Using a craft knife or razor blade *carefully* cut through your marks, creating slits for the curtain rod. The edges may fray when you cut. I just trimmed those where needed.
7. When I first attempted threading the curtains on the rod, the burlap didn't lay very nicely. I think because it's so stiff, it didn't have a very nice shape...not at all taylored to the window. After some Winnie-the-Pooh "think...think...thinking" I decided to try fan-folding the curtains in between each slit/hold and iron the edges down to make a crease. WORKED LIKE A CHARM, giving me this result: