Hi David I have just had the chance to read the installation instruction for your machine I think the second stage of bed leveling is calibrating the auto leveling system so it is the first stage with a piece of paper which sets the zero height reference for the system auto leveling compensates for lack of flatness in the bed by adjusting the z axis. In general auto levelers are troublesome things and quiet unnecessary if the machine print bed is flat which is why many user install Glass beds.