The author has mentioned that soft skills are skills. Which means that they need to be gradually perfected - you can't learn without trying. But here's what, I think, wasn't stressed enough:

Don't be afraid to fail. You will fail, sometimes. Some people can just have a bad mood. Some are just jerks. And for some, you'll be just "incompatible" to create a meaningful connection. It's okay, you'll have to just accept it and move on.