First of all, excuse me for my crappy english, I speak spanish
The vintage voicing and the switcheroo are used in some Tom Anderson guitars.
www.andersonguitars.com/vintage.html "Vintage Voicing is a passive circuit that is switched on and off automatically so that the single coil pickups think they are seeing a 250K pot while the humbucking is seeing a 500K pot"
I'd like to do that to one of my guitars, but I don't know how Is it too hard for a begginer?
Welcome to the boards. I'd say that the "Vintage Voicing" modification would produce very subtle changes and I'd think it not worth the trouble of doing all that work. The "Switcheroo" modification seems much more worth your time. With a humbucker, Series / Parallel / Coil Cut are very noticeable changes. (You don't have to use the specific "Switcheroo" circuit, either). I'd go to this menu and read the sections on "Series Parallel" switching and "To Phase Or Not To Phase"
If you want to test the Vinatge Voicing idea, just put a 470k resistor across your output. That plus a 500k pot, will (near enough) make the pickups think they are feeding into a 250k pot. See if you can hear a difference, although I think Wolf will be proved right that it would be very slight at most. If you liked it for the single coil however, just permanently fix it across the single coil wire conections, before the switches. That way, with the single coil off, the resistor doesnt affect the humbucker.