Hiccups will come. Plan for the long-term by leaving a margin in staff time, customer expectations, financial resources and server capacity.
"Each of you should look not only to your own interests, but also to the interests of others." -Philippians 2
Nobody can see their blind spots on their own. That's why we're quick to listen and not too proud to admit when we've goofed up—to a customer or to each other.
None of us is more or less important than the others. When we succeed, it's because of everyone's effort.