Aren't there enough horror stories? Isn't the craziness well known abroad?
In most of the world people who want to be tourists in the USA dread the extensive and humiliating application interview, questionnaire, and documentation process just to get a visa. The same is required to change planes at a US airport.
The process is byzantine and irrational. Read all the available documents and hire a lawyer if anything seems uncertain.
The border authorities routinely retain old documents, especially those submitted in error, and use them in a Kafkaesque process to deny all future permissions. Every thing you say or send to the government can be reinterpreted and used against you forever. It would be best to consult a lawyer every time you interact with CBP, though that would be expensive.