Watched as two guys broke up about a 12' part of the sidewalk that leads from the driveway to the front porch with a sledgehammer and masonry chisels. That's work! Part of the sidewalk had sunken below the level of the part adjacent to it and we'd noticed people tripping on it during the last year and we weren't going to wait until someone got hurt.
Then they put in a good bit of rebar and mixed and poured the new section, all by hand, no cement mixer, in a wheelbarrow but the end result looks very good. Very clearly they had done this before many times. Later in the day one guy came back to remove the wooden formers on the side and load the broken up concrete in the pickup truck. All this for $350! I gave him an extra $20. That was a lot of work for what I think was not much money. He did a good site cleanup too.
The thing is, I tried getting more-established concrete companies to do this and they didn't want to bother with that small of a job and quoted minimums of $1,200 and higher, so I gave up and went to Craigslist and hired a guy who showed up when I called and said he could do it the next day, I guess he didn't have much work and needed the money. I was expecting to pay $400 to $600.