hand and with the other simply stoke the razor along the entire length of the blue jean for 10 to 20 strokes... I like 20... then switch directions... the threads of the jeans run in a diagonal so switching directions allows for an balanced approach to fine tuning the blade's edge. This is similar to using a straight blade on a leather strap... this is cheap or free considering you have a pair of jeans! It will take the fine nicks out of the blade and allow for you to keep the blade very sharp ...