Click on the video link.
It's a promo for their cabling supplies and tools. I'm not steering anyone here as I don't use all the tolls they show here. It's fairly simplistic and isn't the only way this can be done. Not all connectors have the "load bar" insert so you don't angle cut first. This is really a skill that comes with practice but it's not that difficult once you develop your own knack. The hardest part is getting the wires lined up and held in place and knowing where to make the cut so the cable sheath goes just the right distance into the connector. You've got to make a nice squared off final cut and push the wire firmly into the connector and make the crimp. If you can see 8 nice shiny ends of the copy wire up against the front clear plastic of the connector, you got it right.