This is what I have started.
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I learnt that I have to do the gridding the hard way, when I was doing my Michael Powell freebie. It was small, but I lost count so many times - MP is a bit excentric, so sometimes I just left it like that, and didn't bother, but I decided, never again.
I just take a ruler, count ten, and draw a line with my water erasable pen. You have to be very careful with counting, then it is easy to refer to the lines. I usually do a small area at a time, like one-two blocks- and it is easy to notice if I made a mistake.
With this, though, it was quite difficult to draw the lines, because the pen is like a felt-tip pen, quite thick, and linen has so fine rows. So I decided to make the counting first with stitches. You can see that on the edges. Then I drew the lines following the stitched marks. It took me longer, but I wanted to be sure!