I have a 2000 f250 super duty truck with a 7.3 diesel engine and I need to change the glow plugs but do not even know how or where they are located

With the engine "stone cold," disconnect battery, remove valve cover, disconnect glow plug connector, remove glow plug with a 10 mm deep socket, install new glow plug (torque to 13 ft.-lbs.), and reattach connector. After finishing the remaining 3 glow plugs on that bank, clean valve cover, install new gasket, and reinstall valve cover( torque to 97 in.-lbs.). Do the same thing for the other bank of glow plugs and reconnect battery. Not a difficult job--should take several hours