Update
Well I made a dumb error and didn't realize it until I finished. Turns out I marked the positive and negative leads on the clips wrong, I'm going to need to swap them.
The above information is all correct, just make sure you mark the clips right. (Measure twice, cut once)
From the injector harness, each injector has 2 wires going to it. A yellow/black one, and a colored one. The yellow/black one is the 12v power source, and the colored one is the ground (this goes back to the ECU). (Cyl 1 happens to be brown)
The instructions say to connect the red wire from the driver to the injector 12v power wire. From what I saw our car doesn't have a single injector power wire visible on this part of the harness, as each injector has its own yellow/black power wire. I just decided to connect all of the yellow/black wires and also connect 5 leads to it, one for the driver, four for the injectors. A bit sloppy, yes, but it should work.
Soldier the red driver wire to one of the leads you just made:
Soldier the other four to the remaining open injector clip leads.
Almost done
Now soldier the remaining injector wires from the harness to the corresponding injector driver wires.
Brown goes to the orange driver wire (Cyl 1)
Blue goes to the blue driver wire (Cyl 2)
Red goes to the yellow driver wire (Cyl 3)
Yellow goes to the green injector wire (Cyl 4)
And that's it!
Be sure to wrap everything up and if you can, get another wire protector. I'll update once I do.
Any questions, just ask!