At first, overall confusion. The process of his trial, how it evolves up to the very (abrupt) end was masterfully done imo. I talked to Kyriakos about it and he sold me his view, I combined it with mine, and here is pretty much what I got out of it:
The two main themes that are represented throughout not only the book, but also Kafkas body of work, are authority and bureaucracy. The protagonist starts out very aloof, slightly upset, but seems not at all threatened by his trial. As time goes on however it creeps into every corner of his private life: His romantic affairs, his work, his relationship with his houskeeper and so forth. K. becomes more paranoid, mentally and physically weaker, until the ned where he basically willingly subjugates.
Authority is portrayed as something that is not really acquired through achievement, intellect, hard work, but rather more or less arbitrarily divided under an elite-group of ruling men, hence them often being portrayed is completely incapable. It is a destructive power, only available to few, who almost live in a parallel society, remember for example the way the courtrooms were set up: Almost impossible to reach, in remote areas, hidden, full of thick smoke, make people feel physically uneasy and so forth.
Bureaucracy is in this case the essential tool of the person in power, it makes them almost untouchable. The painter tells K. that there are realistically only 3 ways for him to tackle his case: The real absolution (nigh impossible), the seeming absolution (not satisfactory) and dragging the process on for as long as possible. As we get to see later on, K. defies all these three bureaucratic ways and picks the easiest option, which is death. Bureaucracy is also a tool for dehumanization, allowing each person to be treated as a case.
Since I read it in German, I can say that the prose is very nice, although even as a Kafka fanboy I will admit that he is too lengthy at times. Sometimes these lengthy parts convey absolutely essential information, but sometimes they don't. I like his thick, descriptive, exact prose, he makes great use of the German language. I like the way he develops characters and how dynamic his books feel. What are your thoughts on this book? I can't think right now, got a lot of stuff going on, so sorry for my confused answer.
Blok, the merchant, probably presented K. with a gloomy image of what he would too become in time. That said, he only dismisses Blok when the latter readily sacrifices K. in hope to look better in front of the councilor; and K. already disliked the councilor and had made himself his antagonist for the girl working there too.
And while that girl has some kind of membrane joining two of her fingers, she probably still looks a lot better than Kafka's actual affairs

