Remember that the Rishonim and Achronim are smarter than you and far bigger Talmidei Chachomim than you, who have gone through Kol HaTorah Kulah more times than you finished Chamisha Chumshei Torah. Then you will better be able to realize even if you think they are wrong on an issue, that they knew more, thought it through more and knew the Torah far far better than you so that it is you who is mistaken – you just can’t find the point of where you went off the rails and see how they are right. But you intuitively know they must be right even if you can’t understand how.
Just as if you, on your couch, think Albert Einstein made an elementary error in the Theory of Relativity you’re not going to come to your next course in undergraduate Physics 101 and relate to the professor how you found a mistake in Einstein’s theory.