Looks like your well prepared. Go for it!
I also got the cable kit from forerunner and was looking at what it was going to take to put in last night. Instead of undoing all the nicely wrapped wire loom im thinking of just cutting and capping the main leads to be replaced as close to the wrapping as I can. Then install the new cable kit and zip tying to the outside of the loom where needed. Most of the ground cable can just come out and go in. Let me know what your thoughts are.
I'll let you know how it goes and will probably be adding to this thread during and after