measure twice and cut once

(literally, carpentry) One should double-check one's measurements for accuracy before cutting a piece of wood; otherwise it may be necessary to cut again, wasting time and material.1872, "Dressmaking," Hall's Journal of Health, vol. 19, no. 12, p. 280:Look at Carpenters! . . . In old times it was a proverb "Measure twice, and cut once."(figuratively, by extension) Plan and prepare in a careful, thorough manner before taking action.2008, Hilary Johnson, "Mergers rattle bank relations," Financial Week, 9 Nov. (retrieved 9 Nov. 2008):Mr. Paz noted that since the onset of the credit crisis, eBay, like other companies, hasn