 Self-doubt on this picture would be a state in which you’ve drawn conclusion q, say because your confidence in q exceeded a given threshold, but also have reason to believe your reliability with respect to q is not as high as that confidence, and such a state would be a violation of GC. Whether this self-doubting state can be coherent when a subject knows her own beliefs depends very much on how the reliability aspect is formulated. If chances and propensities that your guesses are true are determined by frequencies of ordered pairs of guesses of q and truth or falsity of q then self-doubt will make one incoherent here in the way that representing oneself as an anti-expert did above, because coherence and expected reliability will be logically  equivalent.[2]  In any case, GC requires matching between the orders in all cases, and tells us that the match is between your confidence and your reliability.