No Hesitations or Regrets...Well

Write without hesitations or regrets, even if the writing sucked. Well...I wouldn't take this statement to the extreme. There are times when we should be prudent about what we write and reflect on it before moving forward to the next project. But don't slam on the brakes in hesitation and constantly look back in regret either. Have a balance. 

Writing is never about perfection. Writing is about using a creative process to make progress. When you write, it's a constant learning experience. The more you write, the better you get. So there's no need to live in hesitation or regret. If someone hates your stuff, even if it's valid, all you can do is nod, shrug, and say I did the best I could at the time.  I've found this to be true with technical documentation, especially in the software/API realm, where constant changes are the norm, even after publishing. I had people who quite frankly didn't like how I wrote something. Okay. Whatever. Everyone is a critic.

Of course, this isn't an excuse to be blasé either. There's also no shame in admitting you were wrong, even if you genuinely believed you were right when you wrote something. Only you can answer that. No one else should force you to say so. You should also be humble enough to take constructive criticism and feedback. This is another way to get better.

Having this balanced mentality will help you to move forward as a writer.