Technically speaking, I think tracelifter has the right idea.
The method being described is called "pig-tailing"

Taking multiple wires, join them under a single joint/terminal, and feed the joint with a single lead or pig-tail.
So in your case, wires which enter, terminate, and leave the connector will have 3 wires when you finish instead of just two.

The pins are very sensitive to proper crimping. If not done properly, they may not even fit into the bracket. Also, you can create a high-resistance connection by distorting the pins while crimping. I wonder about shortening the rated life of the connection by "double-lugging" - the process of putting too many wires under a single terminal rated for installation of a single conductor.

http://www.molex.com/pdm_docs/ats/TM-638000029.pdf
This article from molex really does a lot to explain the subtleties of crimp-style terminals.

One thing that I do while crimping which seems to help.

I use the next larger "m" die to pre-shape the connector.
The next larger die seems to help with the in-curling of the crimp. Then, I move the the next smaller (and correct sized) "m" die for the final crimp. This extra move really helps the bellmouth take shape. Also, starting with the larger die allows a little forgiveness if one needs to adjust the conductor and insulation position within the crimp.
I use this double move for both the conductor crimp and the insulation crimp.
It sounds tedious but I rarely foul a terminal as a result of the extra effort.

*edited to say* - I normally use the Ideal #30-426 Service Tool