there are some ideas online -
http://hyena-in-petticoats.blogspot....-tutorial.html
http://quiltzine.com/cathwindow.html
http://sometimescrafter.blogspot.com...al-window.html
http://april-makingendsmeet.blogspot...-tutorial.html
now if you don't mind wasting a tiny bit of your fabric, you could take your yardage and measure over 9 inches and clip the fabric and then tear it across. then take that strip you just tore off and press it and then cut your squares from that.
that way you wouldnt' have to handle all that yardage and fold and try to cut across it.
good luck.