The beautiful part of writing is that you don't have to get it right the first time, unlike, say, a brain surgeon. You can always do it better, find the exact word, the apt phrase, the leaping simile.
写作的美妙之处在于，你不必像脑外科医生那样，第一次就把事情做好。你总能做得更好，找到准确的词，恰当的短语，跳跃的比喻。