I think the biggest thing to grasp is that you are no longer going to be able to code 40 hours a week, and if you are doing so, something is terribly wrong. I personally found that the number of interruptions caused by managerial duties made it impossible for me to get in the zone; if I needed to do complicated tasks, then they were done at home at night.
Figure out what motivates every individual on your team, because it will become the basis upon which you guide them. Take advantage of their interests and aspirations when assigning tasks and help them grow along that path. You are now concerned with the big picture, and it is your responsibility to share that picture with the team and address their concerns proactively.
And if you can't trust your team, they probably don't trust you either.
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