People with schizoid personality disorder avoid relationships and do not show much emotion. Unlike avoidants, schizoids genuinely prefer to be alone (but not all the time) and do not secretly wish for popularity. They tend to seek jobs that require little social contact. Their social skills are often weak and they do not show a need for attention or acceptance. They are perceived by others as humorless and distant and often are termed "loners."
People with histrionic personality disorder are constant attention seekers. They need to be the center of attention all the time, often interrupting others in order to dominate the conversation. They use grandiose language to describe everyday events and seek constant praise. They may dress provocatively or exaggerate illnesses in order to gain attention. Histrionics also tend to exaggerate friendships and relationships, believing that everyone loves them. They are often manipulative (I wouldn't use the word 'often', but I can be very manipulative and persuasive at times).
Narcissistic personality disorder is characterized by self-centeredness. Like histrionic disorder, people with this disorder seek attention and praise. They exaggerate their achievements (This is something I do very little of, but I have done it before), expecting others to recognize them as being superior. They tend to be choosy about picking friends (It's not that I think people are unworthy of being my friend, it's just that I'd prefer not to be friends with some people because I find them to be annoying, stupid, arrogant, or something else), since they believe that not just anyone is worthy of being their friend. Narcissists tend to make good first impressions, yet have difficulty maintaining long-lasting relationships. They are generally uninterested in the feelings of others and may take advantage of them.
While Obsessive-Compulsive personality disorder (OCDP) sounds similar in name to obsessive-compulsive anxiety disorder, the two are markedly different disorders. People with obsessive-compulsive personality disorder are overly focused on orderliness and perfection. Their need to do everything "right" often interferes with their productivity. They tend to get caught up in the details (I don't think the extra attention I pay to details necessarily causes me to miss the big picture, but it's there) and miss the bigger picture. They set unreasonably high standards for themselves and others (I wouldn't say they're unreasonably high, just sort of high, and I don't tend to be extremely critical, just a little critical, and sometimes I don't bother criticizing), and tend to be very critical of others when they do not live up to these high standards. They avoid working in teams, believing others to be too careless or incompetent. They avoid making decisions because they fear making mistakes and are rarely generous with their time or money. They often have difficulty expressing emotion.
I feel that the unbolded parts are very inaccurate.