Yes you got it right
EDIT
that is to say; if whilst attempting to turn the tire with your arms, you accidentally push the car off the jack you will get seriously hurt. So make sure the car cannot move forward or backwards; chock the wheels on the opposite side.
You could start the engine and put in in gear,rev it up a little and see if the jacked up tire spins. If it doesn't and you put more power into it, you could drive it off the jack and damage the car. But you would have no idea of what the actual turning torque might be...... so don't do that.
