They often blow up in your face.
Mitigate the surprise and the stress by imagining everything that could go wrong BEFORE you actually set your plan into action.
Plan for your failure.
Interestingly, I think the more you mindfully and healthily plan for your failure, the more likely you might win.
As my Dad says, “prior planning prevents piss poor performance.” He adds the third “p” for emphasis.. because he’s like that.