A few years ago I moved a 1000+ pound slab of concrete and raised it 30 inches to make a table without a single jack, crane or power tool.
I used bits of rock and a pole. Lever and pivot points to "walk it" across the yard and simple split fire wood and wedges to raise it to height.
And it I did it all by my little old self.
The 'secret' of the pyramids isn't that big of a secret to anyone who knows anything about levers and pivot points. A small group of men, 20-50 can move stones many tons in weight and raise them with relative ease. Do it a few hundred times and they will have it down to an artform.
As for precision of placement, its not done now days because no one actually cares to do it. We can do it, and we can do it with primitive line of sight tools. It is a bunch of bullshit when people say that we can't do what the egypitians or other large stone monument people accomplished. We can't say that until we set about to do it (really do it it) and find that we can't. We can theorize all we want.
Another fellow figured it out in Florida and built a huge array of coral stone crap all on his own.
Coral Castle has stuff like a giant stone rocking chair that rocks with a push of a finger, and a huge slab 'door way' that turns on a tiny pivot point with ease.
It doesn't take magic, aliens, Gods, Giants or the like to accomplish these things.