Kind of controversial take on note taking systems. I can relate though, because i was lost in a burden of creating perfect knowledge management system for a long time without creating any knowledge. Simplest approach with commonplace notebook is what working for me now.
Comments are also useful.

> Getting lost in your knowledge management system is a fantastic way to avoid creating things.
> Most heart-stopping writing comes from synthesizing the previously unarticulated in the moment. Rather than reaching for your database, try channeling what’s in the air at this very second. These read/write errors are what we call originality. 
> Leonardo da Vinci kept all of his notes in one big book. If he liked something he put it down. This is known as a commonplace book, and it is about how detailed your note-taking system should be unless you plan on thinking more elaborately than Leonardo da Vinci.
> Shun the useless adoption of the aesthetic of the useful. When something can be like work or like play, never make it work.