Although it may look like a lot to do for one silly mission, it really isn't. I was stuck on 5-3 for a few years because I was scared of all the trouble/time spent doing it. Yet, when I finally got around to it, it took a few hours per path at most.
I shouted for an hour one day, we scheduled a run for the next day, and we continued onward from there.
The plan was to finish CoP together but I got left on 8-2 due to rl schedules =[
I probably rated you down.