Transforming Into Dickie, Already?

Once again, Tom has this feeling he is being followed home. “If there was any sensation he hated, it was that of being followed, by anybody”. This creates some interesting things to think about. Does Tom have a reason to be paranoid? What kind of baggage or history does Tom have that makes him feel like this? The whole notion of being followed late at night gives the story an eerie feel as well. Was Highsmith just creating this paranoia to enhance the mysterious tone?
Nearly right after, we find out that Tom is a con artist who has the skill and intelligence to steal money from clients, who think they are paying taxes to Tom’s company. His sneaky antics may have something to do with his paranoia. In this chapter, we start to see that Tom may not be so suave and humble after all.
Lastly, on page 17, Tom takes off his clothing in the mirror “watching every move he made as if it we somebody else’s movements he was watching”. In reading this for the second time I couldn’t help but think of the scene that appears later in the novel, where Tom is acting as Dickie in the mirror. Is the process of Tom mentally transforming into Dickie happening already?