Being what some refer to as a "truest" of Mentalism and a major supporter of the "old school" way of seeing and doing things I'd be amiss if I did not offer my two cents worth on a quite amazing resource "Mind Reading & Telepathy" by Erik Jan Hanussen--Steinschneider released this past year by Jimmy Bix and a collection of characters ranging from Banacheck and Bill Palmer to Borodin and Dr. Toni Foster.
The book is 153 total pages presented as a study course planned for commercial release by Hanussen, the text outlining in rather concise manner, the means by which he was able to spellbound audiences throughout Europe and in several instances, captivate members of the NAZI high staff, including old Adolf himself (even managed to get a commission from Hitler to retrieve a special Mandrake root used as a good luck token. This side of their relationship is not mentioned in the book but it does open some interesting doors should one choose to explore said route.)
In the plainest of terms Hanussen was a master Muscle Reader and that is precisely what this book is about (along with some rather rudimentary thinking associated with what we'd call "Psychological Forces"). If this book had actually seen the light of day as planned by Hanussen, it probably would have stood the whole of Mentalism on its head, for nothing as concise nor of the "lineage" associated with the skill, had ever been made available prior to this time and even since those days, the majority of what's been shared has been questionable at best.
I'm a major fan of Muscle Reading/Dowsing in that it is a talent quite common in my family; one I was first introduced to at a very young age by family members that used dowsing as a means for finding sweet water springs, lost items, and of all things, Ginseng plants (within Appalachia ginseng is poor man's gold and people actually got shot over stealing from someone's stash). For a good number of years this was something I worked with almost daily e.g. I developed a high level of skill as well as understanding behind it; my inner pack-rat seeking out any and all published materials I could find on the topic in that it remains the one single demonstration that science itself recognizes as being a form of telepathic communication (albeit, nothing remotely close to what the folks at the Sci-Fi channel would wish).
When it comes to this particular book I can only say that anyone that considers themselves to be "serious" students of Mentalism who have it in their personal agenda to deliver something more than a magic show with a "Psychic" veneer, owes it to his/her self to get this book and actually work the process as outlined by Hanussen, giving yourself a good two-three weeks or more with each lesson phase.
Yes... the book is a bit complicated to decipher. Bill Palmer, who helped translate most of the book comments on how Hanussen tended to be a bit "wordy", the theory being that he saw it as a way to make himself look more educated than he really was. Nonetheless, you will need to take your time and re-read certain areas in order to gain a more clear understanding when it comes to the instruction and course of action. You will also need to set aside your own preconceptions when it comes to a few of the terms he uses such as Telepathy, Medium, Seance, etc. His application being common to the era and what is best described as the "Spiritualist Remnant" and its fascination with such things.
Couple this material with what you find in Banachek's PSI Series (disc 3 I believe it is) and of course his PSYCHOPHYSIOLOGICAL THOUGHT READING dissertation and I'd say that you would be well on your way towards developing a personal sense of adeptness when it comes to the use of ideomotor action. Understand though, this is a potentially HUGE field of study that goes well beyond these three chief resources. The serious student venturing into the varied disciplines employing both, Pendulum and Dowser's tools in order to better round out his/her understanding.
I know this hasn't been the more traditional sort of "review" we have around here but that is due to the fact that the material is nowhere near "traditional"
How difficult is it to learn the material?" You ask
That depends on the student. If you aren't willing to invest yourself into it and constantly experiment with each step in the learning process, you will fail! On the other hand, if you are serious about your study and desire to develop solid MR skills, there is no reason why you can't be working at a quasi-advanced level within 9-12 months.
Not everyone will catch on as quickly as others and there are those that are literally too analytical to learn it (in that they are trying to figure things out and thus, start assuming and guessing rather than paying attention to the ideomotor cues). The technique does require us to kind of turn off our conscious mind in order to gain the greatest sort of sensitivity.
What Are the Advantages of Studying This Material?
With but very limited exception, this single skill is about all you will ever actually require for doing on the spot demonstrations of your "Intuitive" abilities. You can literally do a full 60 minute program with this material and NOTHING ELSE (Hanussen did a two hour show, regularly).
However, those seeking to become something that leans closer to the original definition of being a Mentalist/Mind Reading would be doing themselves a huge favor by taking us some supportive study (and development) in the area of Billet Work, Readings (legit divination systems as well as "Cold Reading" adjuncts), and of course a mnemonic/code based system. With little other than these foundation skills, you can start your own religious movement or, if you have the right sort of charm and creativity, a headliner on the Las Vegas strip

The bottom line is, this is a most excellent book that can open your eyes to a good many things, not just how to develop your MR skills.