Identifying your weakness in forex

One of my weaknesses I realized the other day is that all the tools that I utilize to plan trades are imprecise and nothing more than a casual line in the sand where I anticipate a future event to occur.
 
 I am a precision engineer by trade. The tools and methods I use are accurate to 1000 of a millimeter. Being out by a tenth of a millimeter can render an entire job useless so my mind has become conditioned to perfection…or intolerant of mistakes. This mindset is necessary because as long as you follow the rules and trust your equipment the result is always as expected. This creates a big challenge for me to overcome. 
 
 I have to ‘unlearn’. 
 
 I have to completely change my expectations. A mind conditioned to certainty and accuracy has to adapt to uncertainty and randomness. I can tell you this is difficult. 10 out of 10 jobs I do in the workshop are perfect, in trading 5 out of 10 is an achievement! I’m like wtf?
 
 Simply telling myself to become zen with random doesn’t gel with me, because unfortunately I have a resolute brain which requires a crowbar and heavy lifting hydraulic equipment to get it to change its way of thinking. This is my challenge and something I am determined to overcome. 
 
 Whats your weakness?