The best entrepreneurship book I've read is "Anything You Want" by Derek Sivers. It's really simplistic and gets to the core of a lot of ideas when it comes to starting a business.
One thing you have to be careful of is that there is a general tendency to want to tear you down, even if it isn't intentional. People capable of starting their own business often do not because they are cynical, able to identify every little thing that may go wrong. They bring the same attitude to your idea and aggressively attack it. Their intention may be good but they don't understand that a business plan is something of a joke, most of it will not go according to plan and you're going to have to improvise a lot along the way.
I talked to a bookstore owner today that told me she is $50,000 in debt, lost money for 3 years straight, and considering quitting the business. That's when you know it might be time to fail. If you have the passion about your idea then 2 months before it starts is not the right time to quit.
At the same time, back to the Sivers book, he makes a good point to wait until you have an idea that sells itself rather than something you have to try to force upon people. So I'd expand it beyond one person and see others' reactions, specifically potential customers.