Some great tips and like everything on this forum i have learnt some more tips.
I always try and work on my cars at home with the tools I carry. If I need something from my garage I will then consider whether I carry that as well. I have always fitted expanded metal behind my grilles as you would be surprised where you collect large insects, stones etc and Grilles today aren't grilles!
Besides split tube over all wiring I also add rubber "pinch weld" or insertion rubber over areas the cable will run, especially sharper edges to minimize any chance of chaffing.