Why do you need to be that accurate? Think about it; your compass or DI only has intervals marked at...is it 5 degrees. So can YOU fly to an accuracy of one or two degrees? I certainly can't. Much more important to keep your eyes out of the cockpit. If as well as your planned heading you compare with ground features and dead reckoning, you'll know soon enough if your heading is working or not, and if not you can adjust it, whether that's been caused by inaccurate track correction or the forecast wind being wrong.
Learning to use a whizwheel accurately is a good idea, but I sometimes wonder if the fact it's so accurate means that people lose sight of what's possible, or even necessary, in the air.