Remember that everyone can have an off day.
Sometimes I go in and feel and operate what I perceive to be sharp as
and on the ball like a real pro.
Some days I make many stupid errors and feel like a plank in the left seat. Ultimately though as long as it's a safe aircraft and gets A-B I don't really care if I forget to call MSA or do an RVSM altimeter check. As long as the situational awareness is there it's ok.
People can weigh to heavily on the polish sometimes and forget it's the overall operation that matters.