Hi:
Consolidate your thoughts - man, are you right on!!
Consolidate your thoughts by zeroing in on the most essential BA tasks. The primary purpose of a BA is to come up with a comprehensive, integrated understanding of essential processes/functions/tasks - and especially - their interrelationships. (While there are also essetential data and data relationships, process/function drives data, so that analysis is where you want to most concentrate.)
Essential = BUSINESS critial. Essential interrelationships for process/function analysis are data flows. Learn the essentials of data flow diagrams (not just the mechanics of creating a DFD) and then you will be able to properly position DFD's, Use Cases, User Storys, BPMN, Activity Diagrams, etc., etc., relative to each other. Don't learn DFD essentials and all you will ever have is an unconsolidated mish mosh of techniques.
DFD essentials: Logical, natural decomposition vs forced, artifical decomposition, need for a litmus test of completedness, non-sequential nature of systems (especially at higher levels of abstraction), Agile approach to big picture modeling.
Tony