take a sledgehammer to crack a nut


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take (or use) a sledgehammer to crack a nut

use disproportionately forceful means to achieve a simple objective.
A sledgehammer is a large, heavy hammer used for such jobs as breaking up rocks and driving in fence posts.
1998 New Scientist Fighting tooth decay by annihilating mostly harmless bacteria in your mouth is like taking a sledgehammer to crack a nut.
See also: crack, nut, sledgehammer, take