[rlowe61]

One last thing that hasn't been said, but possibly implied. Many times if you aren't building a prototype (second bot), if you want a clean wiring of your bot, you'll have to make the initial runs a bit long and messy, then go back and clean them up. Many times I've wired long messy runs, to test and get it working, only to go back and run the wires neatly and cut to length (new connector). You have to make sure if you plan on doing this, you include the extra time it will take to make these corrections/cleanings. Many teams when prototyping will work on the placement of the components on a bot. When building their compitition bot, already know where everything is going and build their electronics board away from the drivetrain and minipulators only to bring it in and make the final connections. (trim wires to length and connect)
It takes Time (lots of it) and Planning. Sometimes more time planning then actual time doing the wiring.
Like has been mentioned, practice with controller boards in the off season to get more time and experience.