Anyone lay their own concrete?

Hey FABO. I’m planning a 40x48 pole barn shop. The total amount was a little crazy so I’m looking for ways to save. The concrete alone was quoted at about 12k (includes forming, material, and labor). My math says it takes 21yd of concrete for a 4” slab. At $160/yd that’s about $3400 for the material. So over $8k in labor for a slab seems ridiculous. Is it really that hard? Anyone do this themselves?
I try to do all by myself but u will need guys to help screed and move the mud like 4 friends, but form it, rent the tools to do the job dig out your pad, I add 3/4 rock as base for the 4" concrete to set on these days they reinforced concrete so u may not need metal mesh or rebar order your truck have guys ready to speed out your mud and rent a float
Buy some trowels edgers. Go to town. No easy it will wear you out.