The knob connects to the throttle stop screw by a length of flexible drive (like curtain wire), so you'll feel it being a little "springy".
The thread up at the carb end might be stiff, that's where you need the lube. If the knob doesn't turn easily, or it feels like something's going to break, don't force it. You'll need to lift the tank and airbox to get to it to clean/lube as required, not a difficult task.
Set the idle when it's at normal running temperature, and make sure the choke is fully off. It's sometimes easier to adjust it by turning it up too high then backing off rather than gently easing it upwards fractions at a time, the springy drive tends to wind-up a bit.
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