David Copperfield only feels comfortable with a new trick after doing it five hundred times. That is a lot of repetition, a lot of learning what does not work, and a lot of getting it into muscle memory.
He does this on stage in front of paying customers. Paying customers watch him as he is uncomfortable and struggling to get to grips with a new trick. I suspect they do not notice.
Five hundred times — that is more than there are days in a year.
He does this in less than a year: David Copperfield averages six hundred shows a year. Three shows per day, most days.
That is what commitment to learning and growth looks like: Doing in the open that which is uncomfortable with high regularity