At Least a General Idea of Psychoanalysis You Need to Have

Correct Zen practice, in the long run, is akin to psychoanalysis in many respects: the sense of reality that you attained during zazen, decodes and gives the correct assessment of the thoughts that come to you mind - in this way your self keeps changing. That's why at least a general idea of psychoanalysis you need to have. In addition, those terms that two and a half thousand years ago were introduced by Gautama Buddha for the description of mental processes now are mostly outdated, so it's better to think in the new terms.

Unfortunately, I don't know what to recommend in English on this topic for beginners. If you can read in French or Bulgarian, try these two books by Pierre Daco:

Les Prodigieuses Victoires de la psychologie moderne 

and 

Les triomphes de la psychanalyse -

I read these books in Bulgarian in the 90s when I was in Bulgaria - strongly recommend - they explain psychoanalysis in simple terms, give an idea of its connection with neuroscience and an overview of all mental illnesses: where mind can wander. Try also by the same author

Comprendre les Femmes et leur psychologie profonde -

since I read it, I'm no longer afraid of women! ;-)

I like Freud and Jung (sometimes Freud even more than Jung.)

In addition, for general knowledge, I also recommend Erich Fromm's Escape from Freedom and
The Courage to Be Human (especially the chapter THE X EXPERIENCE AS THE MYSTICISM OF THE ONE)
and Eric Berne's Games People Play.