Our self doubt, easy to doubt butt what of our own self doubt

  Epistemic self-doubt is the special case where what we doubt is our ability to achieve an epistemically favorable state, for example, to achieve true beliefs. 

there is definitely nothing logically problematic about doubting someone else’s competence to judge. However when we turn such doubt on ourselves, incoherence seems to threaten because one is using one’s judgment to make a negative assessment of one’s judgment