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Downshifting helps regulate the speed of the truck and is useful if the traffic slows down in. To downshift, press down on the clutch while engaging the brake and put your truck in the next lowest gear. Once it's in gear, let off the clutch and press down on the gas to maintain your speed. You never really have to downshift into first gear because second gear doesn't require high RPM. Unless you want to stall out, you need to put the truck into neutral whenever you want to come to a complete stop. To do this, press down on the clutch while letting off of the gas and push the stick into the center. Then, once the truck has been put in neutral, you can stop and start the truck's momentum without stalling out. Pressing on the gas pedal in reverse can feel jerky and fast. Instead of pressing down on the gas in reverse, use the disengaged clutch and brake to control your truck. Slowly lift off the clutch with your left foot and tap on the brake with your right foot to control the truck. This trick will work unless you're on a steep hill, in which case you may need to apply the gas pedal.
Downshift when you need to slow down. Put the stick shift into neutral when you stop. Use the brake instead of the gas when reversing.