I accomplished it by squelching the conversations in my head about random shit - most of which was speculating future scenarios. These conversations of the past or future events are primary for me because I don't visualize - i.e. I don't have spontaneous visual memories or willful recall of visual detail of a memory. The conversations begin slowing when I began working on solving dissonant thoughts that lead to additional future telling of events. Now my mind is quiet, although full of questions about reality. It's a double edged sword!