Testament to children's interest in construction equipment is the commercial success of the British theme park chain Diggerland[0]. I'm not affiliated with it, and I've never been, I just think it's an hilarious concept.
I dug the footings for my house on my first day ever on a backhoe, the next day I removed a few trees and built a road, then I rented an excavator and did all my underground electric in one weekend and underground water main in another. All with no experience with any large machinery nor any electrical or plumbing experience, so the weekend comments can definitely be incredibly valid.
After a few weekends I definitely don't think I'd ever consider hiring someone for any ground equipment too simple to do yourself if you have the time. Cranes might be a different story (I've moved multi million dollar equipment after a few hours on warehouse overhead cranes, as did practically everyone else in the company, but not the freestanding ones), but not sure because I used rafters instead of trusses so I could just carry all the roof stuff up in single sticks as renting cranes without an operator doesn't seem to be possible here.
Takeaway here is homeowner can probably do everything as long as they use rafters instead of trusses, to compensate for potential issues with the crane.
cement is one job I would be careful of. You can do it yourself but there cannot be breaks or mistaves as cement is curing and losing strength all the time.
The breaks are tied together with rebar, the mistakes on top were mortared level when starting my run of blocks for the foundation. Got pretty much perfectly level by last run of blocks.
Ghetto? Maybe, but a civil engineer friend said he did cold joints same as I, and the house has held up so far....
I am basically pushing my concrete to 1% of theoretical limitations, never freeze cycling it, and cold joining it exactly how my civil engineer friend did in rigorous commercial project (when asked about this he laughed, large commercial projects usually need breaks because it's too big to do one continous pour, i simply applied same technique) . Let the unpaid contractors mutter from outside my DIY walls... if they stop standing it's more likely a wildfire than the hand mixed concrete.
IRC will even allow you to use masonry as a footing, although you rarely see it.
I'm not downplaying how much someone of average competence can pull off, but when the chips are down experience counts for a lot.
I say this having replaced 140' of rotted logs in our log home this summer. Some full length. We got it done, but there was some sketchy use of car jacks, bottle jacks and a comealong to finish the job. I am 100% certain a pro would've gotten the job done with far less stress and far safer setups.