There is a critical difference between relying on luck and putting yourself in a position to exploit luck when it occurs.
relying on luck would be the 125% finance, no backup plan, hope things get lucky approach.
being prepared would be to live under your means and to have the resources (and the cajones to use them) when the opportunity arises. RE: cajones, it is too easy to get to a situation where one is risk averse when being careful with expenditures.. one has to look at risk-loss / payoff ratios.
The real trick is to know the difference between relying on luck and being prepared and willing to exploit luck.
Luck can be attributed to the randomness. It can either be good or bad. ie stock, large price drop is good if you want to buy in, bad if you are holding (on margin?)..