Based on the advice from comments in the previous post, and my quickly losing interest in the gridding process, I've decided NOT to grid the fabric for Paradigm Lost.
After 10 minutes of gridding, I started thinking, "This is ridiculous. I've never gridded before, these are all separate motifs and I should be able to stitch this without a grid." Then I thought, "This isn't like one of those HAED pieces with multiple color changes and edge to edge stitching." And then I thought, "If I have to grid out this HUGE piece of fabric, I may stop stitching forever, and possibly throw myself under a bus." So I stopped gridding, pulled out the single piece of thread I started with, and we're all happier for it.
I had been hesitant about using the red thread all along anyway, as I've seen several complaints about stitchers having a hard time getting rid of the red fibers left behind whenever they've frogged out that thread.
But DH did take the chart to work this morning to photocopy it. IMO, those Long Dog patterns are expensive, and I don't see any point in ruining the original when I can just as easily stitch from a photo copy. Even though I use plastic sleeves for my charts, I have a tendency to fold them up here and there to focus on the section I am working on. Which means I am usually working off a copy if the original is a large chart or printed on cardstock.
I would also like to add that I am grateful for all the advice I've gotten, especially Vonna and Tracy J, both of whom not only commented, but replied to my emails with great advice as well.