I'm with bdog, level the dirt out (and ideally compact it) before you put the stone on top. Then it's just a matter of visually distributing the stone in an even layer. Definitely good enough for a run-in shed at that point, anyway.
I probably would have leveled and compacted the dirt beforehand, and then had the dump truck driver tailgate spread it for me in two strips. How much did you get, somewhere around 5 yards I would guess?
In any case, 3/4" limestone without fines is real easy to shove around if needed. What do you have on the 3-pt now? Just use that, lol. No need to overthink it.