I do my best proofreading after I hit send.
We all know the moment right after clicking send when we suddenly see the typo or think of a better way to say something. Something about that final action makes us see our work more clearly.
But this is exactly why sharing messy, half-finished ideas is important. When we try to put thoughts into words, we're forced to see what's really there versus what we thought was there. We don't spot the holes in our thinking until we try to explain it to someone else.
Not until we hit the metaphorical send button do we see what's wrong. Trying to make our thoughts clear to someone else shows us exactly where our ideas break down.
That's why friends who don't mind your rough drafts are valuable. They let you work through half-formed thoughts without judgment, giving you clarity just by listening.