1. Climb out of my box.
2. Think.
3. Don't get back in the box afterwards.

Joking apart I'd say there actually is a process but it's not quite that simple. It's something 'Street Epistemology' explores:

1. Defining a deeply held personal belief.
2. Grading your confidence that it's likely to be true on a scale from 0% > 100%.
3. Honestly assessing whether your level of confidence in your deeply held belief is arrived at via reliable (testable) means or simply personal opinion / gut feeling.
4. Asking yourself if a non-partisan individual would unquestionably arrive at the same conclusion or perhaps have an equally unsupportable opinion contrary to yours (Remember that 'I don't believe you' isn't a contrary opinion - it's not being convinced of a pre-existing one therefore the burden of evidence falls entirely on the claimant not the skeptic).
5. Reassessing whether you level of confidence should really be as high as you imagined in the light of seeing why it possibly being less supportable than you may have presumed.

Here's a good example of Street Epistemology:

I think that being an artist as I am is part and parcel of thinking outside the "box". I usually just let a problem or new job percolate in my mind for some time before trying to actually start any work on the idea or job.

Thinking outside the box. Guess it could be triggered by many different things. Including people with pessimistic comments. ????

Meditation and yoga are a big part of my life and what keeps me mentally and physically fit.