The key is to get it down in a form that you can look at without having to continue to introspect.

Korzybski puts it as turning the dynamic process of thinking into a static object that can then be interrogated.

Once you have produced a visible or audible translation of your thoughts, analyze it the way you would if someone else had written it.

I've thought of that as the benefits of multiple personality disorder. Taking on another persona to do some thinking is helpful. Isn't there a metaphor of "wearing hats" for the same thing thing around here?