Since everything is created in the present moment, the idea that you are at the mercy of existing beliefs, is a limiting belief...
Realize that whatever ideas (beliefs) that you currently hold, are JUST ideas and can always be changed in the present moment. It is not necessary to dig through the past and attempt to uncover reasons (existing idea/beliefs) as the culprit for a lack of progress.
THE PRESENT IS THE POINT OF POWER.
Read "The Nature of Personal Reality: A Seth Book" by Jane Roberts. Seth preceded Abraham, and probably due to Jerry's fascination with the Seth material, I am sure that Seth had a profound influence on the material Abraham delivered.
In my opinion, the Abraham material is more practical and user friendly; however there is no replacement for "The Nature of Personal Reality" as a foundation.