If something manifests, it’s not because you wrote it down, but because it was already on your mind – and in your mind’s estimation, was the best outcome for you. 
The purpose for writing down barriers is multi-fold…
First, writing brings it out of your mind – releases some of it’s stress, and opens you up to doing something about it.
Second, combined with the daily action taking, journaling, and subs listening; those barriers get transformed automatically.
Emotional subs like Regeneration, Elixir, or Sanguine will remove the emotional charge of the belief. Within days, you will feel it go down in intensity - like from 8/10 to 1/10.
Reframing subs like Rebirth, K1, or G1 will bring you new perspectives by which to see the same situation/story/concept. Within days, you would be laughing at your old belief because a different perspective will seem to be a truer frame for the matter.
