If you're trying to learn Reiki as in how to "do it," people will try to push you to take classes and get certified. I think most of the people out there claiming to offer and train in Reiki are liars and relying on the placebo effect, so tread lightly. I do believe in Reiki but I'm speaking from a few personal experiences.
I did have a book that said if you can't find a teacher, you can ask the spirit of Mr. Usui yourself. While this seems logical in a mystical way, I don't think it's that simple. Again, my cynical self thinks they just want to keep turning the page.
The concept is not new and there is plenty of information online, but the "brand" of this type of healing called Reiki is very much about certification courses and money.