The following post is by Lvalio (Lair):
Lal Said: “Here is another key point:
Listening is not required to attain the Sotapanna Anugāmi stage.
It is also clear that a Sotapanna Anugami is also freed from the apāyās. See, “Sōtapanna Anugāmi – No More Births in the Apāyās”
P.S. In other words, a Sotapanna Anugami is guaranteed to attain the Sotapanna stage”.
Now, if one attains the Sotapanna Anugāmi stage it´s clear to me that soon or later he(she) will attain the Sotapana Stage. So I think that the most important thing is not to read or listen but learn the Dhamma, understanding the Dhamma…
That´s what I think.