Useful info
 practice is enlightenment
In Zen terms we say honsho myoshu. Honsho means intrinsic enlightenment; myoshu, subtle practice. We say practice and enlightenment, or realization, are one. How is it one thing? When you sit, your zazen is the zazen of the Buddhas. Your zazen is sitting Buddha, or Buddha's zazen. So your practice is realization itself, enlightenment itself. Your zazen becomes anuttara samyak sambodhi itself. Have this kind of faith. 
Usually when you do zazen, zazen becomes a cause to create some kind of effect, such as enlightenment, frustration, anger, or whatever arises. That is the wrong way to do zazen. Your practice is not something by which you attain some place else or something else. Your practice itself is a fulfillment of honsho myoshu, the originally enlightened life.