what I found useful to help understand projects was to use David Allen's analogy of "projects" as being like headings in a file drawer and if you store all your projects together e.g. in Outlook under a category called .projects..it's like you have a quick overview of what is on your plate. Then put your NA by context e.g. I am working with a client on a spreadsheet...so I have a project called Name.Spreadsheet and NA would be to send her my solution and now I am @waiting for her to come back with comments etc.
You are in the right place for lots of help though!