They are not difficult to replace. You can make a jack screw to replace them easily, all you need is a bolt and a couple large washers and a couple wrenches/ratchets/air wrench, to replace them, or a press if you remove the leaf springs completely. Preplacement is pretty simple, jack the van up and block the body, not the axle, loosen the nuts from the spring front and rear, when they are loose at the connection points, pull the bolts out and jack and block the body up several inches extra to give you working room. Since the bushings are bad, the inside of the bushing can be knocked out and the outer shell bent or chiselled out of the end of the spring, although they are a tight fit, the end of the leaf spring is not welded/closed, so usually it is rust that holds them in place, so they do come out with minimal force. If they don't come out easily, a jack screw is a heavy walled tube that fits the outside of the bushing against the spring end and a long bolt put though it to be tightened, another sleeve fits the outside lip of the bushing, that will, when the bolt/nut is tightened, push the old bushing out of the spring. new bushing can be simply sucked into the spring end with a flat washer against the side of the spring and a bolt put through the bushing. I have used sockets large enough to get the bushing moving out of the spring, many times a piece of pipe itself will fit to allow the bushing to pass through the tubing without getting stuck. A large flat washer and then a nut to tighten and suck the bushing into the spring works well, make the bolt the size of the inside of the bushing to keep it straight when installing. Do one side at a time and you won't have a problem or have to actually remove the springs from the van. You just saved $795 or more!