Electrical - I'm I going to shock myself?

[mokie]

I have a wiring Diagram that I have received from this board. So, thank you guys for helping me. Though, I don't feel confident so I have been getting quotes to do the wiring and it ranges from $2400 - $1100 w/out a new harness. So I'm going to start working on it this weekend. Here is my question:

Where or can you tell me how the lines run through a 72/blazer body/frame. I have pictures of how they are supposed to connect to lamp, cluster conn, fuse pnl, etc... but I would like to know where they are supposed to run w/in the body. Or is this just how do you want it to run through the body?

Also, if I do connect wires wrong what is the worse that could happen. Please specify what connection and to what it is that would be the worse outcome.

Thanks again

Please help