I am convinced that there is no simple formula or technique...

I am convinced that there is no simple formula or technique that would immediately allow you to master the ability to be guided by the voice of the Spirit. Our Father expects you to learn how to obtain that divine help by exercising faith in Him and His Holy Son, Jesus Christ. Were you to receive inspired guidance just for the asking, you would become weak and ever more dependent on them. They know that essential personal growth will come as you struggle to learn how to be led by the Spirit.