Second the suggestion for the Molex terminal crimper. I have one (Molex brand, even) and it makes beautiful terminal crimps.
If you want to get really persnickety you can instead get a ratcheting type crimper. But, in practice I've found a hand crimper like the one linked above does a great job.
If you want to get really persnickety you can instead get a ratcheting type crimper. But, in practice I've found a hand crimper like the one linked above does a great job.