The heuristic that I use is to admit to myself what I fear about making the decision. Work out how I can handle any downside and then go for it. Of course, some decisions require a bit of research and for those I write up the pros and cons and then choose the best path.<p>There is a great book "Feel the Fear and Do It Anyway" it details many scenarios where people find it hard to make quick decisions. You might find it useful to read up on how others handle their fears of making a bad decision.