how hard is it to replace the radiator?

It's about 1.5 hours labor pretty straight forward operation. Look at www.rockauto.com for a good quality radiator, or Napa , There is a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online