Actually I don't think in many cases even a guru, let alone a lowly expert, can give a definitive "Yes, that is correct" answer. Most of the questions are pretty open ended and depend a great deal on context, or even on context at a particular moment in time.

I personally believe you may be interested to know that some scientific studies (awarded nothing less than a Ig Nobel prize!) established the so called "Dunning-Kruger effect" by which:

1. Incompetent individuals tend to overestimate their own level of skill.
2. Incompetent individuals fail to recognize genuine skill in others.
3. Incompetent individuals fail to recognize the extremity of their inadequacy.
4. If they can be trained to substantially improve their own skill level, these individuals can recognize and acknowledge their own previous lack of skill.