Having all the answers is not the goal. Motivating the team to find the answers is the goal.
To evaluate the strength of a manager, look at the strength of their team.
The first time any of the above happens on your watch, it’s always new and hard, no matter how many books you’ve read on the topic. But the fifth or tenth time or 20th time it happens, you’re no longer freaked out. You realize that you’ll be fine.
Lots more interesting points in this and part 2.