You can buy cheap crimpers for those JST or Hirose connectors in the low $80.00 range. there are several drawbacks to that connector including the fact that they are really used for assembled modules and NOT as a readily and easily removable, robust device for the experimenter as they are rather fragile as well. They were meant to plug and essentially forget type of connector... IMO
I used them once in the devices I made and only because it would have cost more to replace them with the connectors "normally" used in my production devices. They were a pain to use as well.
Doc