Most people with Obsessive-Compulsive Personality Disorder do not experience their rigid standards and need for control as a problem. The people around them tend to notice first. That limited insight is one of the harder aspects of treating OCPD, and it is what Metacognitive Interpersonal Therapy was designed to work with.
A detailed 2008 case study published in the Journal of Clinical Psychology followed a man with both OCPD and avoidant personality disorder through this treatment. Rather than moving straight to changing behaviour, the therapy first builds metacognition: the ability to notice and understand your own mental states accurately, and to see how they connect to your patterns with other people. In this case the work combined individual and group sessions, helping the man recognise how his perfectionism and emotional suppression were linked to avoidance and to difficulty connecting with others, then gradually building more flexible ways of relating.
A single case study cannot establish that a treatment works for everyone. What it offers is a clear illustration of why simply pointing out the problem rarely works with OCPD. Genuine change usually begins with helping someone see their own patterns first.
If insight into rigid or controlling patterns feels hard to reach on your own, a psychologist can help guide that process.