You should have at least a 12 inch repeat.
DO NOT wash the fabric because it will be distorted in pressing.
Cut the fabric in half, lengthwise, using 1/2 for the squares and the other 1/2 for borders. You need to find your repeat. You don't square up the first edge because this will let you know which piece is your cutting piece, or template. You place the first cut on the fabric and line it up so it matches. When you have all 4 pieces cut, you place them on top of each other and use the flat headed pins to hold the 4 pieces together. Place the pins so you don't cut over them with your rotary cutter. Another method I like to use, I pin, then I put a dab of Elmer's Washable school glue where the pin is, then press with my fingers, then go to the next layer, etc. The reason I now do this is because it seemed that no matter where I put my pins, I had to move them, when it came to cutting.
I hope this helps you. If not, I'm sure someone else on here will be able to explain it better than I.
Decide on the size you want your cut to be, it will depend on your pattern repeat. Because my repeat was 26 inches, I was able to cut 6 inch strips and then cut those strips into 6 inch squares. You will be cutting 4 squares that are the same with each cut.