Formal training means a way to structure your thoughts and assess risks. Don't dismiss it out of hand.
Most college new grads are not exactly CEO material from the get-go.
Sure, many of those things could come in handy in the future - but there are far more difficult things which you also have to learn "as you go".
Lots of people just want to be their own boss and run a viable business.
Interestingly, I see several tech startups of this nature started by folks having a deep understanding of a specific business problem due to their prior work experience tend to create such startups.
As a service provider for small businesses, I see many amazing bootstrapped services & products come up around the world, that serves a very specific need for a small subset of customers. These viable businesses tend to make enough for the needs of 2-3 folks for a long time. I have a strong inclination towards finding many of them as a service provider because they just tend to be some of the best customers with great ROI.
(This radar often goes off when I hear someone refer to YCombinator as 'the Harvard of Incubators.')
I think to be a great founder you have to not only know how to handle failure, but to also be OK with everyone dismissing your venture as a failure, as something even laughable.
Wouldn't it be cheaper and more educational to just launch a side-business and keep it running for a year?