Knowing what ideas to invest in both your time and value to others can be hard. Simple is scalable, complex often creates obstacles. Can you explain what you're building so that anyone can get it. If you have to over explain the value then the idea may be too trepid.
Distribution is definitely challenging even for startups that are well funded. Funding or no funding, while the latter may help it doesn't change user adoption rate. So many great products unfortunately don't get a chance because of distribution.