You can never become so good at customer service to quit working on it. Teamwork is the way to get it done. Standards that are non-negotiable. People who share a common sense of direction can get where they're going quicker and easier because they work together. Service starts in the back lines.
Service comes from within, one person working with another to get it done and get it right.
Hire nice people. Because not-nice people do not treat customers or fellow employees well. Hire nice people and train them in what needs to be trained. You can't sit in your office and run your business. You've got to get out with your customers and see what's going on.