If you think it's hard now, just wait until you start the business, it becomes mildly successful, and now you want to bring in someone as a co-founder to help you grow - it's twice as hard then. I'm going through that right now and it's tough.

I don't think cofounders need be friends before starting - I think that like-minded people hang around each other so, if you're in an area like the Valley, there are more people of your mindset and you'll find it easier to co-found with a friend. I think co-founding is tough and there are no easy ways of doing it.