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to be honest, the wiring always seems like the scary part, but if you get both diagrams out and sit back with a clear head and study it, you should be able to piece it together.

As for the nickel and dime stuff, thats currently what im experiencing with my own car. You just have to sit back and take time. All big projects dont complete in a year. Stuff like this takes time, but you are usually well rewarded for your patience in the end.