In an idealized form any performative act is of its nature without fault. If that is so, why do so many have performance anxiety. Every such individual makes mistakes viv-a-vis the source material. In my estimation, the only real error is one that removes the performer from the current context fixating on the previous perceived "mistake". This condition in my estimnation is not a performance but is instead part of the required preparation of skills and study of the source materials. The performer who has not completed his preparation is attempting study and preparation during a time when others are actually trying to perform.
Hence, I regard this as two entirely different acts/mental states: study first, performance when and only when one has completed the study. Yes that part is an ongoing process.