What makes a good Mistress?

I have been asked recently to work with several dominant women, they wanted to learn how to be a Mistress to their partners. The following are points that I think are important qualities for a Mistress.

Mistress’s vary in attitude, colour, shape, philosophical beliefs, style, motivations and passions, however most ladies I have meet who deserve the title Mistress all share the following characteristics.

Six Attributes Every Mistress Needs" include:

Self-confidence. "What a person thinks of herself contributes to the image others have of her.... Gaining self-confidence ... takes self-examination and a clear appraisal of oneself...."
Trustworthiness. "The frequency with which the word trust appears in the Ds community's conversation is no accident.... There isn't a single Ds activity that doesn't depend upon and benefit from mutual trust."
Consistency. "How the Mistress acts sets the example and teaches the slave how to be.... For a slave to submit there has to be a framework in which he can 'know the rules' and develop dependable expectations."
Responsibility. It's the slave's responsibility to serve. The Mistress is responsible for the relationship.
Acceptance. ".... until you accept yourself as who you are, there will be a struggle that will make true realization of your Self difficult, if not impossible."
Expertise. "Experience is the best teacher and good technique is crucial to success...."