Individual psychotherapy varies greatly from practice to practice and is generally dependent on the personal style of the therapist and the condition of the patient or client.
Therapy for people with personality disorders varies from validation and listening on the part of the therapist to more rigorous programs such as DBT and CBT.
Most therapists will not give a diagnosis of a client or patient. Psychological diagnosis is generally only performed by clinical psychologists or psychiatrists only and reserved for people who are hospitalized, criminally prosecuted or ordered to take a psychological evaluation during a child custody dispute.
The most effective therapy situations are those in which the person with a personality disorder is committed to getting help, following up on treatment, substituting healthy behaviors for destructive behaviors and taking medications where necessary,