do you ever feel stupid...after know the mistake but

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i want to tell you that I got frust after 1 long week, work from 10am until tommorrow 1am or can be say 15 hours. the shop got a lot of car need to be overhaul, top overhaul, change timing belt and other. ok here is the problem with myself actually, do you ever feel stupid after you know where is the mistake but you are keep doing the same mistake. like my mistake is forget 1 thing when repair the car, whether the skru not put on, nat put on, or just 1 thing i forget to put on. so how the hell can I do to solve this kind of problem?any idea friend???? it feel like a spell that I keep do the same mistake, i feel stupid because my boss or my brother need to ask me to double check or this that have been tighten on every time I do work with the car.