Hey MaryBarth,
I'm glad you liked the story :)
One thing you need to succeed in your new role is to keep reasonable expectations to both parties (the customer and the team).
Don't set the customer's expectations so high, in a way that may hurt your team, or even lead to delivery of substandard solutions.
If possible, have daily syncs with your team, play the game of numbers, i.e; they tell you on a scale of 1-10 how confident they are at delivering a given feature in a specified timeline. Then, get a prudent way of communicating the numbers to your customer. We all know, clients are interested in the general output and numbers, but not in team dynamics, and or effort required to pull off features.
If the client is too demanding, learn how to hold your position, and let your yes be YES and no mean NO! Though, most clients don't want negative responses. You can always figure out a way of communicating alternative solutions to them. Solutions that will play great on your team's side and client's side.
Hope you have a great career.
Cheers.