Moving stone - need landscaping advice

[Raven]

first talk to a septic tank guy...who has a professional opinion
since thats that risk issue at hand ...,(not the grass)just to hear
him say: what you can get away with....rather than do some damage..... and wish you had later...

no sense having a major setback and some stinky repairs.

you cannot beat a commercial wheel barrow ...considering (assuming) this is a long term project and a little material has to go here and there.

So its not so top heavy.....
you can load the wheel barrow 1/2 full with some crushed stone,

then you have (build) a home made wheel barrow 3/4 plywood top that has interior or underside cleats to keep it from sliding off for block with a smaller perimeter cleat on the top outside edge if needed. remember to keep your load (weight) over the front wheel...

then you have the best of both worlds with no rental fee or fuel
considerations or septic tank worries.

As for hired help....find a patient neighborhood kid who's built like an OX and set up a work plan schedual for time.