For what it's worth, the "directions" that come with the hot water heater kits leave a lot to be desired in my opinion. They basically amount to a schematic. The instructions I had...and I have installed several heaters...basically just showed the layout, but the instructions did not tell you what to do first, second, third, and so on. I basically just started a one point and put it together. The benefit to having the schematic layout/instructions is that you can see how things are laid out. It was helpful from that perspective. More helpful to me was Joe Young, for those who remember him. Joe had an immense amount of knowledge about these trucks and was helpful in giving me pointers on my first heater install.