I cut it all out first - then sew, chain piecing, press, chain piece, press....I press on an ironing board set up in my quilting room - so I'm not sitting forever. I do like to sew a complete block, or two to see what it should all look like. I stop when my eyes get blurry or I start to sweat - Maybe I'm having hot flashes?? My seam allowances stay more consistent if I sew in longer stretches like this. I have not run in to any errors in the cutting instructions...yet.