A small amount of regionalisation: at least in the UK, Anchor is also a big, reliable floss manufacturer (DMC and Anchor are the big two). Also 'kitty-corner' means nothing to me as a British English speaker (I would say 'diagonally across from').

When you're talking about own areas vs mixed up, I would emphasise that patterns with just a cross or two on their own here and there are really very awkward, much more than you might expect if you've never tried cross-stitch before.

Maybe add something about how to start and stop stitching? I think that's the only thing that strikes me as missing from this, it's a really nice intro otherwise :-)