Anyone know anything about concrete?

X2 what's already been said. When we built our new garage my son & I did all of the advance prep - groundwork, dug footers, spread gravel, put down plastic and wire and built the forms. Then we called in a local who does small jobs like ours (a retired concrete man). He set up the delivery and spent all day working it. He was also able to get a discount on the concrete which amounted to about 1/2 of his charges!
With the construction business being what it is today, you should be able to find a good reputable guy that would welcome a days work.
C