Manifestation happens all the time. It is not something that we "start to do" when we become conscious of it, or our awareness expands. We literally do it all the time. Even "time" is an act of manifestation.
Now, in the paradigm we are leaving behind, we decided to have set, solid, agreed parameters manifested and locked into place, so we could have a very particular type of experience.
The new paradigm we are partly into has us consciously manifesting what we want to experience.
We do this by first deciding what it is that we want to manifest in our lives, and then using various tools to consciously do it...