Roe,
I was hesitant to do wiring myself. Thing is, I do as much of my own work as possible. I had bad luck with mechanics when I started driving. So I figured if they can do it, so can I, and went to the library. It's easier now as you couldn't take the books out of the library. I soon learned I could save a LOT of money by doing things myself. I have learned a bit from trial and error. Just do one thing at a time and pay attention to what you are doing. Take notes if it helps. The work you have done so far tells me you can do it.