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"As a guy who cuts granite every day including the very hard Egyptian granite probably under discussion you need only be absolutely sure of a few angles/lines and you can take it from there."

Could you accomplish what you do today with copper chisels and round pounding stones, because those are the tools we are told the Egyptians used.

[ShadowAce]

Could you accomplish what you do today with copper chisels and round pounding stones,

I'm wondering whether they used diamond-tipped tools. As far as I know none have been found, but a diamond tool would be able (I think) to create the surfaces and angles we've seen.