Usage patterns
手はずを整えるto make arrangements/preparations
I had already made all the arrangements for the meeting.
手はずを決めるto decide on the plan/arrangements
Let's decide on the plan for how we'll escape.
手はずが狂うfor the plan to go awry
The rain threw off all our carefully made plans.
手はず通りに進むto proceed according to plan
The operation proceeded exactly as planned.