There is only 9 wires running the length of that backbone right now and when it's all said and done there will be probably only be 4 there, and the other 5 will stop around the battery box.
I think after I get all the remaining wiring heat shrunk and tidy'd up, I'm going to be really happy I did this. Wiring a 1200 Sportster at this point doesn't seem as difficult to do as once thought. My biggest suggestion would be stare at the diagram for a while until you can pretty much remember what color wires go where without having to look at it.
My wife made me go inside at 1 a.m. again last night because I had to be at work again at 8 a.m. on a Saturday, no less. (These 6 day weeks are getting old, but there almost over.) At some point after lunch today I will know if I got everything in perfect order and the old gal will come rumblin' back to life.
Another suggestion would be to find a good diagram. This one was in the o.k. range.