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Do you feel incapable of learning from experience or are you just very uncomfortable with any amount of uncertainty?
I refine my approximation of my own limitations by trying stuff and seeing the results. Sometimes, I radically adjust my view of what's possible by reading about something that was unfamiliar to me.
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But this just moves the problem from knowing the difference between real and imposed limits to knowing when they are discovered.
Of you have a manual for how to discover limits, please point in that direction.