Verified answer

If done by hand,

Digging four holes with a post hole digger

Leveling the posts and attaching the fence would take about 1/2 a day on site.

I would charge you around roughly 150 plus materials.

If the panels were taller than 4-5 feet a bit more.

having to dig deeper holes to prevent a freeze from shifting the posts a bit more even.

And if necessary/having to mix and pour concrete? (by hand)

Worst case scenario 200-300 and that would be something like a 6 foot stockade, pouring concrete and having to dig 4 foot holes.

What I was taught was, you double the price of the material and add thirty percent extra for labor. That was a long time ago,but I think that sounds fair to me.