You don't have to be prepared to jam luck, the luck can in addition help your weakness to make you sufficient for the task ahead. I would not support as the Op's makes title the heading look but the information contained is good. Luck can not be the fundamental, effort should be, but the luck can be added to it. You can not be a useless and think luck will just work for you like that. You have to get prepared and know what to do when you are offered a task. This is where you get prepared and let the opportunity and luck do the rest.

Those how think it is about working all the time in the hard way that success is made may want to rethink, success can come through any means and you may be less qualified but luck will help out.