You sculpt it into a large sphere at the source site, roll it to the pyramid location, then chip off the curves with a chisel. The leftover bits can be further crunched up into aggregate to act as cement/filler.

Also, don't assemble the Eiffel Tower bit-by-bit. Instead, build a giant mould and pour molten metal into it, then disassemble the mould. The mould itself is constructed bit-by-bit and is far more complex and intricate than the tower but the guy who pours the metal will have an easy job. Just make sure the rest of the work is done by low-value males according to the Tate-Jordan scale, and then their labour is actually of no consequence, much like a physicist's thought experiment that excludes gravity to make it work.