Every possible preparation has been made; fully prepared in all respects.
出張の前に確認リストでチェックし、用意万端で出発した。
I checked the checklist before the business trip and departed fully prepared.
試験当日は用意万端で挑みたい。
I want to face the exam fully prepared on the day.
引越しのために段取りを整えて、用意万端にした。
I organized everything for the move and made all the necessary preparations.