first time, have your buddy or family member drive the car with you in the passenger seat. from the passenger seat, shift gears when the driver tells you to. this exercise is best done in an empty parking lot with no nearby obstacles, just in case.
after a few times of the driver telling you when to shift, do it without instruction. sound is your instructor now; if the car sounds as if it swallowed the wrong way and is huffing, coughing, and chugging, you’re in too high a gear and need to shift to a lower gear. when the car makes a high-pitched whining sound, your gear is too low 