Question
How does contractors like http://www.gardeningnorthside.com.au/lawn-mowing-north-shore-sydney/ manages to satisfy their customer's requirements of maintaining state of the art Lawns and Landscapes?

Answer
1. By attending  the classes, studying the text books and passing the examinations.
2. By following the set standards without exception where they exist; or setting the standards where they do not.
For every task of every job, there are minimum standards. Meet or exceed these standards and you can keep your job. Fail to meet them and you put your continued employment in jeopardy.
3. By keeping up to date. Attend the trade shows. Seek out refresher courses. Join a professional organization and participate in its activities. Understand clearly the Laws that govern your work; obey them.
4. By understanding that customers need you to do essentially two things.
    a)Provide a product and/or service that satisfies or exceeds their expectations.
    b)Maintain a pleasant relationship while doing so.
The foregoing is equally applicable to "North Shore Sydney" as it is to the "one man" operation.