Since you have a tremor that increases with intent maybe somehow you can figure out how to have your cutting hand/arm at rest when cutting. If you have ever seen a painter making letters on a project you might have noticed he rested his painting arm on top of his "resting" arm; he uses the resting arm as a brace decreasing the chance of shaking while trying to make a straight line. Perhaps you could "rest" your cutting arm on the cutting mat and this would lessen the shaking enough for you to continue to cut your own pieces. Good luck. Stay safe.