Nothing to be afraid of as long as the arm has a floor jack supporting it. When you lower the jack the arm will swing down through its travel. This is nowhere near as dangerous as the same job on a coil front spring car(GM) where the only thing holding the spring in place is the arms and the springs can shoot out. On a torsion bar mopar you just have to be careful that the arm doesn't swing down and hit you or the floor. But you must unbolt the front shock on one end since it is a suspension travel stop and you don't want to overextend the shock .
