If you decide what your characters have to do by handling their actions you will lay in peace in your bed and your book will be right, maybe even perfect. However, I won’t read it. If you type without thinking while your fingertips follow, your book will be true and I will read it twice.
If you go through each sentence and analyze the syntax with a goniometer, you will have an accurate text. But if your characters say what they want to say, it will be much more interesting. And if you are afraid of suffering for their sanity, my dear, it means that your sanity is weaker and it will be better to stop trying.
This is what I say to myself each time before sitting in front of my work.