What tool to crimp these connectors
Crimping contacts to wires in a reliable manner requires the proper tools. Very small contacts like the one that you linked are particularly sensitive to damage or unreliable operation if not crimped with the manufacturers recommended tool.

There are some generic tools that are low cost but they are generally very low quality and can only make passable crimps on contacts that are much larger and more generic than the type you have shown. 

Sometimes it is possible to very carefully solder the tips of the wires to the crimp end of contacts in specific test cases. But doing so leaves a connection that is extremely susceptible to breakage, solder getting in to the contact area and difficulty getting the contact into the connector housing.