Thank you all for the tips.
I am not worried about bleeding and I loved a the crinkled look of a washed quilt, so I will not prewash.
I have two 60 degree rulers, one has the tip off one point. I will try and few cuts and see which works best for me.
Thank you for the tip about using leaders and enders, I had not thought of that at all.
Thank you for the recipe for homemade starch, I may give that a go, I have a refillable spray bottle, or I may dip the fabric in the starch.