Now for the passenger side, I used a self tapping screw and put the harness right by the overflow tank.
IMG_0035.jpg
There is also a spot down below by the engine that there is a hole already there, you can just put a screw in there and mount the harness there.. Picture is really blurry but the black dots are the holes.
IMG_0038.jpg
For the passenger side, you have to do the same thing as the driver side, but you have 90% less room. This is where small hands come in play, otherwise your hands will feel like they've been through meat grinders. Some people take the whole headlight assembly out, I DO NOT recommend doing that. Some people also take the overflow tank out to give them a little bit more room.
To be honest there is no real easy way to do the passenger side, it is a royal pain in the ***, but very doable. You can move the hose by unclipping it and moving it out of the way, this helps a tad.
IMG_0034.jpg
That's it, if there's anything else i've missed / need help with, please let me know.