Hahaha , yes I do prefer mills them lathes can move awfully quick and the worpiece moves very quick . Again I am only trained on a Haas lathe , the G28 command will send the turret all the way to the right back as far as it possible goes and ( at least on the one I trained ) that is the safest place to do a tool change. But try this put the machine in MDI ( manual data input ) and type
G18 G20 G40 G80 G90
G00 G28 U0. W0.
then hit start .
there is no toolchange in these lines and no spindle command so it should be very safe to see where the turret ends up. ( I do operate a lot by trial and error and that's usually what I do when I am unsure )


EDIT: darn I always think of something after I hit submit , do not confuse G28 with G54 if that is what you are referring to when you say Z0. , your G54 Z0. is where your part 0. is the G28 is where the machine has its 'Home' or 0. position.