No power drill, no circular saw, just a hand saw, a set of clamps, wood glue, and a countersink. It took longer, about six hours instead of the two a power-tool version might take, but the quiet process was worth it for a small apartment where power tool noise wasn’t an option on a Sunday.
The biggest lesson was that clamping matters more with hand tools than with power tools, since there’s no motor doing the work for you; a poorly clamped board wanders under a hand saw in a way it wouldn’t under a guided power saw.
The shelf isn’t perfectly square, off by maybe two millimeters over its length, but it’s held books steady for four months and nobody’s noticed but me.