I would make a sample block and if it worked out okay I would cut all the block fabrics. I do not cut the borders until I am ready to put them on as the difference in seam allowances when figured over the whole surface may make a difference in the border length. OR you can go ahead and cut the borders allowing some extra for the difference in seam allowances. I like to measure the quilt before I cut just to be sure. I don't like to have to piece on an extra inch! NOTE: Even though you think you are sewing a good 1/4 inch seam you can be off just a tad and it's good to check it occasionally with several rulers to be sure!