[robocat]

Conversely, learning how to tell who are lemons, and you must not join is also critical. Just because a few people are doing a start-up that sounds good doesn't mean it is a good idea to join those people. One must also learn to have enough insight to work out if one is a lemon oneself - http://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect

Another great place to learn these skills and to pick the really skilled is in an incubator or shared space. That has also worked for me.