How it used to be in my experience
In large companies it used to be that only one in 40 internal proposals for innovation would actually reach the market outside: all the other possibly bright ideas failed to overcome resistance from inside. If you opened up a business, it would take three years before you knew whether it were sustainably viable or not. If it were new in some important way, you especially expected to struggle with problems of all kinds.
To accomplish something really new in business, you need much more than a great idea, not least on the side of character, courage, determination, stamina and mental strength. All of these, and the rest, are more to do with subjective emotions, feelings, personality and heart than with objective knowledge, skills, ingenuity and head. The latter can even be fun, but the former brings stress.

Pressure is relentless for any Founder. You can easily get ground down until there's no energy left. More than three in four owners suffer from anxiety, sometimes from things outside their control. Entrepreneurs may be working for 16 hours a day, even on weekends, so home life is threatened. One certainly needs the right kind of business partner, most especially your husband or wife. In such a demanding atmosphere, it is not surprising if arguments spring up.
However, if you envision some way in which you can turn an idea into something concrete, to do something good in the world, these hazards can be avoided or at least alleviated, if only you can manage them. Why succumb, like more than one in three founders, to the temptation to give it all up, when you can recognise your problems for what they are, as well as what you fear? For the problems you have to face up to, there is always a good process, and this must embrace both emotional energies and rational disciplines. Reason is no good without feeling, a conclusion made very readily when people make decisions.