I'm just getting started with the wiring on my -9A. A big box of goodies is now waiting for me to install them on the aircraft. I'm doing Skyview and VP-X. Simple VFR panel. Minimal systems and switches.
I have spent countless hours reading the Dynon and Vertical Power installation manuals and I think I have a good idea now of how everything connects. The VP-X installation guide is an excellent tutorial, along with the online configurator. I made a separate wiring run spreadsheet and broke up the sections by component and detailed every single wire from source to destination. Well over 200 individual wires to worry about, and I haven't even thought about the COMM system yet.
Just take it system by system and don't over think it. Most of the wires only have a single destination (engine sensor, flap motor, light, etc.)
I was prepared to have to buy a bunch of bare wire, but the VP-X harness kit provides plenty, and along with the EMS and Skyview harnesses, there is only a minor bit of extra wire that I have had to buy (coax and shielded strobe wire).
The decision making is the slow part. Once you have all of the equipment and supplies in hand it is just a matter of running one wire at a time.
Have fun with it!