It takes the same amount of time and effort to create a good quality manual as it does a bad one.
A bad quality manual that nobody reads or uses is a common mistake. Yet, customers judge you by it, ISO auditors start with it, and your own employees, should refer to it for everyday guidance on quality policy within your company. A good quality manual should be easy to understand and even easier to use:
The best advice is to avoid common mistakes, focus on a better quality management system.