In this case, I doubt that there writing that get's to the heart of the issue that accessible to people without an NLP or hypnosis background. I'm also from Germany so a lot of the sources from which I actually learned are German.

As far as programming and complexity there a nice chart of what taught in a 3 day workshop with nested loops: http://nlpportal.org/nlpedia/images/a/a8/Salesloop.pdf

If you generally want to get an introduction into hypnosis I recommend "Monsters and Magical Sticks: There is No Such Thing as Hypnosis" by Steven Heller.