So maybe I can chip in since I also have started installing Bearbu's 360 kit myself a couple weeks ago...
I'll answer for the front camera install part, since this is what I have completed so far.
Installing the front camera is actually not too hard. (as lowtech mentioned installing the side cameras is the most difficult). You can simply route (and hide) the 360 front camera cable on the passager's side under the different hood's rubber covers. If that can help, I mostly followed this youtube video to do my front camera install:
That youtube video is for a different camera kit but routing is the same... I passed my cable behind the rubber into the cabin as shown in the video around 11:30