Capable people suffer from imposter syndrome, inhibiting them from trying something new or difficult, or afraid of trying things they aren't god at yet. In this

Capable people suffer from imposter syndrome, inhibiting them from trying something new or difficult, or afraid of trying things they aren't god at yet. In this case "Fake it till you make it" is great advice. A different set of people may suffer from Dunning Kruger effect or delusions of grandeur, in which case it could be terrible advice.