Thought Id write an update for you - checked the stitch count and the pattern is actually 20inches square. I gave up and bought a big, 26inch wide, roller frame for tapestry and am working on it 2 handed by leaning it against a table as I go!
I finished a large project that required a yard of linen and I did it entirely in hand. I would just gather the fabric to the stitch area or roll it to that area and stitch away.
I recently finished a piece that was 36" x 36". I did it entirely in hand (no hoop or qsnaps) and just gathered the fabric in my hand. I have used the round hair clips to hold the extra fabric by rolling it up and putting the clips around the fabric.