Crimping tool?

or

amazon, electrical crimper, sorted by price

https://www.amazon.com/s?k=electrical+crimper&s=price-asc-rank&crid=3GVG883VGATJC&qid=1671036384&sprefix=electrical+crimper%2Caps%2C91&ref=sr_st_price-asc-rank&ds=v1%3A7VJeoqfgS%2FxBjkubTkpP5%2FabZgZ8%2FuDz74Cy5xFywmE

If you know how to solder (any audio enthusiast should really learn, if they don't already know how):

1) strip the wire to be attached to the connector

2) with a Needle Nose Pliers; delicately crimp the wire to the connector

3) for extra added conductivity, add a small amount of solder to the connection

Don’t forget the pin insertion tool!

^ and a depinning tool

Machine crimps nearly fuse the connector and wire into a solid. It's almost impossible to achieve with a hand tool.

Assuming it's a one-time connection and is for audio, better results are obtained by soldering the wire to the header holes. All connectors are audible.