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Object Space: this one will separate object into two parts from center of object and it doesn't care where is the position of object in the world space.
World Space: this one will separate object into two parts from center of world axis. note: when you choose world Space mode it will query the selected object's volume if the majority part of object was in positive area of world space the separated piece should be placed in negative area of world space. it is intelligent.
symmetry direction: YZplane will separate object into two parts along the YZ plane. ZXplane will separate object into two parts along the ZX plane. XYplane will separate object into two parts along the XY plane.
symmetryButton : it should separate object into two parts. now you can work on one side of object and the other side of object is symmetry.
FinaliseButton : when modeling done press finalise button to combine the separated pieces.
How to install put the " kk_symmetry.mel " into your scripts folder then launch Maya