I think being born into a loving family who valued education and always feeling like I could do anything i set my mind to. Meeting DH so early and being so similar with our plans (we met when I was 16), being healthy, born pretty intelligent, in a first world country, these things are all luck.
Choosing DH, taking the right job offers, grabbing any opportunity that came our way, having children after getting our feet under us, but still young due to having met early, buying then selling a house at just the right moment due to being able to make fairly good guesses, not wasting money on 'stuff' etc, these are good calls.
Yes we work hard (well DH does at the moment I mostly eat hon bond and MN) but lots of people work harder and don't get anywhere. We are both pretty clever but I wouldn't say brilliant so you have to acknowledge an element of luck.
We always seem to land on our feet.