The mediator shall possess the qualifications required under Civil Practice and Remedies Code, §154.052, be subject to the standards and duties prescribed by Civil Practice and Remedies Code, §154.053 and have the qualified immunity prescribed by Civil Practice and Remedies Code, §154.055, if applicable. The parties should decide whether, and to what extent, knowledge of the subject matter and experience in mediation would be advisable for the mediator. The parties should obtain from the prospective mediator the ethical standards that will govern the mediation.