I feel your pain. I have the same problem myself. I think I have done a good job with cutting, sewing, etc and then find the blocks are not the same size. I am working on a quilt now that has the same problem. It is frustrating and maddening but all I can say is I have completed a quilt for my younger sister who nearly cried when she received it and tells everyone she knows you need to come see my quilt from my sister. That gives me the encouragement to continue and remember that this too shall pass.