I think it's a good read from slide #29 on if just for being food for thought.
This might be required for larger investments and bigger projects, but sometimes there's just no substitute for just doing something.
FOR EXAMPLE look at AwesomenessReminders - I'm honestly flabbergasted that it's as successful as it is. He recently posted that he now has 750 paying customers, if each of them bough his minimum program and didn't renew that's something around $7500 (right?)
Who thinks that would have survived a multi round business plan customer segmentation / value proposition etc.. etc...
However - he simply had the idea, did it cheap and quick and it's turned out to be pretty sweet. I find that really inspirational.
Was a great example of the 'best case' scenario - but - there's still plenty of room for an 'elbow grease & just do it' solution.