Have you tried parallel line approach based on Thales Intercept theorem? Usually you make a template by binary divisions (4, 8, 16, ...) on another paper. Regular print paper will do. The 3 division method is illustrated here:
https://photos.app.goo.gl/L7LY4kRAYfPa5z3D8 You can get any number of divisions without any pre-creasing. I believe it is easier than S-method. Happy folding! Sy
