If you are doing some serious plowing, it's hard to hold the plow
controller in one hand, steer with the other and try to shift if
necessary. Auto transmission makes it a lot easier.
Your plow must be more sophisticated than what we had. We had three
levers in the cab of the jeep that controlled the plow hydraulics...up
and down, side to side,and angle. I don't recall fiddling with them much
while taking a run down one side of someone's driveway.