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No leaf springs just wear out from the weight of the vehicle, sure miles, towing, and off-roading are harder on it but they all wear out eventually. About the DIY, I haven't seen one. You should be able to do it without a guide if you have the basic skill set, tools (sockets, wrenches, air impacts help alot, jack stands and a floor jack), and patience.
if there isnt one in the FAQ thread then we dont have one yet on this site, if you would like to write one up take plenty of pictures and post the thread, then let me know so that i can add it to the FAQ thread.