Sometimes finding things isn't so much luck as it is the fact that some people just keep looking. A relative died in 1902 and I thought I had finished researching her years ago. In working on other families, I discovered an online newspaper index for a town twenty-five miles from where she died.
Sure enough, there was an obituary for my ancestor who died in 1902 which I did not expect. Interestingly enough, searches for twenty-five other relatives turned up nothing.
Sometimes the fact that we keep looking makes it seem like luck when it's actually just perseverance.