Grow a habit of checking some (any) system first. BJ Fogg's Tiby Habits program is a good start. And make sure it's a tiny investment of time/energy at first so no full-blown complex planning right off the bat.
Generally reading 'Making it all work' from the GTD guy also helped with just wanting to get everything into some system; which I developed bit by bit using tiny habit changes.
By now I have an amazingly complex system involving a Google Sheet, Workflowy and Evernote that would be just about ready to be turned into a professional product... but getting there I went through dozens and dozens of little improvements of just getting everything out of my kind and into some system.
Generally reading 'Making it all work' from the GTD guy also helped with just wanting to get everything into some system; which I developed bit by bit using tiny habit changes.
By now I have an amazingly complex system involving a Google Sheet, Workflowy and Evernote that would be just about ready to be turned into a professional product... but getting there I went through dozens and dozens of little improvements of just getting everything out of my kind and into some system.