A couple of important things I have noticed about Kriya yoga over the years that are essential aspects of it practice;
1. It must be practiced slowly
2. It is essential to practice with focus of attention
3. The ahh sound (going up the spine) must be deep and at the back of the throat while the eee sound is barely audible and is seen as a thin thread going down the spine.
Whenever I have been checked at an SRF fellowship location I was always watched to see how slowly and focused I was at the practice.
Added to this the ability to keep the consciousness at the Ajna center, otherwise known as the third eye, it is also important in practice and may take years of practice till the eyes are naturally drawn up to point between the eyes and above the nose. It is essential to keep reminding oneself to bring the consciousness back to the ajna center because, looking straight ahead is associated with normal consciousness which is restless and letting the eyes drift below the horizon (down) is associated with subconsciousness which puts the devotee drifting in and out of sleep and dreams.
