when I replaced mine it was a fairly easy task. I hooked up one side spring, put a small bottle jack under the other end of that plate, raised it up bit by bit, when It got high enough slipped the other spring on. no muss, no fuss, easy task.
I had people suggest using a 2 x 4 for leverage, etc. which would be fine if I had superman's help, and three more arms.
bumpy