Here's some of my jig saw work.
Laying the rock together takes some time and requires the patience to try different combinations untill the result works.
I spend some time laying rock and then go pull some weeds or turn some soil for a break.
Figuring out how to put the rock down can be mentally exhausting. I prefer to use rock that's thick enough when I've dug it into the soil, the rocks don't shift. There's nothing worse than stepping on a stone that shifts