I know the feeling, and that's in part how I developed a meticulous nature.
It's gotten to a point where I'll go over an entire set of instructions and perform it in my head before doing it for real. In fact now I go over things start to finish in several passes, first read it all and take note of any warnings that stand out, or things that I don't understand (then I'll go clarify those so I don't get hung out in the middle of building), then a more fine pass to make sure I haven't missed anything, then if I decide I still want to do it I go ahead with the actual process.