What this doesn't tell you is other options for powering example like cutting psu wires or buying generic cables.
its not that hard to work out if your unsure then you need a 2 male molex to female molex cut the 2 male molex off and set them like in the guide.
if your really really unsure theres a couple of users you can buy them off pre made
in total with v2 blades you only need
PSU
basic knowledge if wiring
Ethernet cable
computer to set it up with