If you're going to a psychiatrist, especially one you don't know well, seeking a diagnosis, it's generally good to pretend that you don't know much about the topic and you don't have a specific diagnosis in mind. From my experience, psychiatrists tend to be wary of people who self-diagnose (or even have specific suggestions). When it comes to personality disorders there's an easy way out - just say that you suspect having a personality disorder. If you want to be more careful, just mention the symptoms, not the disorder you suspect. Often you get a more general evaluation anyway. I got evaluated for all clusters, it came up with the results I thought it would come up with.

I learned it from seeking an ADHD diagnosis. I made a mistake of mentioning it to a couple of the first psychiatrists I had. They actively made it harder for me to pursue a diagnosis. They deliberately ignored my symptoms and refused to treat them when I brought them up. It took me over 2 years to get the diagnosis. And you know who diagnosed me? A psychiatrist I didn't mention it to. I just sprinkled some symptoms I have and after a couple of visits I got the diagnosis.