I have a fairly solid startup idea that I would like to pursue. Is it better to take the leap (i.e. should I give my 2 weeks notice from my current job), creat

I have a fairly solid startup idea that I would like to pursue. Is it better to take the leap (i.e. should I give my 2 weeks notice from my current job), create a rough prototype of the product and then try to find co-founders based on the prototype? Or is better for me to try to find a co-founder that I can convince to help me with the idea and then take the leap (i.e. quit day job) to develop the prototype. What's hard for me is that without a 80% working prototype to share with potential co-founders, it's much harder to convince them that the concept is valid via power point slide decks, etc. From reviewing some history on Mint, it seems like Aaron Patzer went solo first, and then convinced people to join him based on his prototype. Are there other success stories like his?