I'm not a big believer in a thing called luck. I believe it has a lot to do with fate and just really having a vision of the way you would see your life.
Frankly - and believe me, I say this without any pretense - when I see the road I've taken, I have to say that thanks to good luck, because without good luck one can do nothing, I've come out pretty well.
I've had the odd good luck of starting slowly and building gradually, something few writers are allowed anymore. As a result I've seen each of my books called the breakthrough. And each was, in its way.