As it's a one off job I would forget the special extraction tool.
With a little care molex crimps can be extracted and prised open,
then solder the replacement wire into place rather than attempt
to re-crimp the weakened metal.
In connectors where the locking tang/barb is visible extraction is
simple , requiring little more than a stiff piece of wire like a paper clip.
As for the larger version found in most computers and many RC models
these are more fiddly as the locking tang is hidden inside. If time is not a factor then rolling your own extraction tool is one method, using a drill bit or something very close to the diameter of the pin as a former. Have also been meaning to try using "polymorph" plastic to build a more durable tool for this application because my local model shop does not stock 0.093" copper tube but I reckon it can be found :wink:
Here's a good link showing the anatomy of a molex pin
**broken link removed**
Section 7 deals with extraction and whole heartedly recomends going in with a small screwdriver on the exposed tang IDC type connectors