I am a retired computer programmer / analyst. However, before I got my degree, I worked for a manufacturer of engines and generators as an electrical technician. I've also had about two years of physics at the college level.
When I learned to drive, American cars did not have synchromesh on low gear. My father taught me how to double clutch to shift into low gear while the car was moving, a procedure that most people never learn.
A previous car I owned was a 1975 Mazda RX4 with weak synchromesh, so I always double-clutched the downshifts to extend the life of the synchromesh. Later, when my sister owned the car, she was not willing to learn to double-clutch, so the synchromesh quickly failed. Then, she had no choice but to learn to double-clutch.