You can do all the research you want but sometimes you need to pluck up the courage and go over the edge to see what happens. Make the best decision you can at the time with information you have. Don't sweat about a bad decision in the future if it turns out to be a bad one because you probably had the best information at present and you made a call based off of that. You cannot make decisions off information that only reveals itself later on. In those scenarios, be a bit gutsy and step over the edge.
Stop screwing around and just do it!