started to work on this today...
just kind of eyeballing things as I moved. i made a line with my hose and used it as a rough guide, rather than following it precisely (put some flour over hose and moved it out of the way as I dug).
i've reached a point where the grade of the yard is higher (a good 6 inches or so). now what? i don't think I want to dig all of the dirt on the high end out. have no where to put it. i learned from the wall I did last spring that I could "step it up" but I haven't been as precise as I was with the wall, so I am questioning how this will look.
I could end the border on the low end and do another on the higher end.