Also included:
Be sure to insert the wires in the correct order to the connector body.
Practice crimping a lot to get good at it. Use only the correct crimper.
Some connector sockets are better than others. We use a type that grabs the square post on all four sides (known as MQS or Micro-Quadlock System, from
Tyco) which seems to be better than what you might get from the robot or electronic catalogs.