A variation of the dreaded "How do I become a quant?" gets posted pretty regularly. (A related one is "How do I come-up with trading strategies?", which I find even worse.) I propose to have a canonical page that everyone can point to, much like the "Where can I find free data online?" wiki.
Users can post their own experiences and then we'll have a collection of stories that will act as the answer. This exercise will hopefully show that there is tremendous variation in both job functions and career paths.