It's really not that bad when you get into it. I've done a quite a few now, so that's easy for me to say...
I've just finished a new video. This one is for the guys that are only replacing a bent yaw arm. It won't help you much because I don't change the ribbon cable in this video.
I'm a few hours into the repair. i want to kill something. this is so f'ing hard.
I'm starting the ribbon in the camera instead of where you did. I think it'll be easier to roll up the ribbon that way; plus, there is some room cut out of the housing (sorry Idk all terms) to lock ribbon after insertion. definitely a serious job; have plenty of light, a magnifying glass and much patience.