It is basically "tube" sewing. You cut strips, sew the strips together. Then you rotary cut them. Mine (a UFO, but not for sake of difficulty, sake of my own OCD) had varying widths. you unsew the tube one strip down for every next column.
It's very easy. I know you can do it. Your pattern will be a bit dif from mine, tho, because of the shift in pattern.
Have fun!