A hint is:
To do it right takes a lot longer than you would think.
Just make sure you have plenty of time and a lot of spare wire. Its a whole lot of extension on some parts of the harness and reduction on other parts. Theres really no easy way. Just take your time and make sure you clearly mark any wires you cut to lengthen or shorten.
I ended up putting mine in the glove box. Its not quite complete, but you get the idea:
Theres not really a better way to explain it online. Just take your time. Its not going to be a couple hour thing if done right.
Good luck!