Of all things that are not conducive to doing them yourself, concrete work and septic pumping are the two least prone to the DIYer. There are several concrete projects you might be considering.
You may be considering building a new home and needing a foundation poured. Or you may be looking at putting in a concrete driveway. Other projects include adding a concrete patio or sidewalk.
Concrete work involved a lot of know-how when it comes to getting the ground made ready as well as knowing the thickness the concrete needs to be in order to support the anticipated load that will be on it. This is non-trivial. Not putting it in properly can lead to unsightly cracks forming that are near impossible to repair. The concrete needs to be reinforced with rebar to add strength. Knowing how to do this is crucial to a successful project.
For a complete rundown of these types of projects, check out Richmond Concrete Pros for great explanations about all these types of projects.