the good news is it’s far easier to go up through the gears than down. you can get used to the motions working your way up, then just come to a stop and do it again. to go up, i let off the gas and press the clutch, move the stick to neutral and release the clutch and then quickly push the clutch pedal back down, and then glide the stick into the next higher gear. no throttle applied during the procedure (you will need to use the throttle when downshifting).
i virtually never downshift into second while moving, and never into first. going into third from forth isn’t too hard to get used to. on the other hand, i’ve had experience with non-synchro transmissions since 1985, so i’ve had some practice.