I have cut sitting down before. The way I did it was this: I used a wooden TV tray and put my smaller cutting mat on it. I set it next to my height adjustable office chair. I put the height if the chair almost to the highest setting so I was able to lean over the TV tray while cutting. This method can put a strain on your neck and back but I was able to cut longer this way than I was able to standing. I didn't cut large pieces of fabric due to the size restrictions of the TV tray.