Regarding printing the grid. I copied the grid and pasted it into a Word document. Stretched the image to full page size, then printed. It is a bit fuzzy, but good enough to use as a model.
With my 5'12", size 8/10 frame, I need all the help I can get to appear shorter than my 6' husband. Though I am lousey at math, I am going to give this concept a try. Thank all you fellow sewers for your comments and explinations and comments!