Let's say I start LDing. Could I pick up a guitar and use active control and believe I'm amazing at it, and start playing like a pro, even though I have no idea how to play a guitar IRL? I know it seems obvious that "YOU are the god of your dreams; if you want something to happen, it will". But I have no idea how to even hold down correct chords with my fingers. I don't have the skill; I don't know HOW to move my fingers in the correct way. Which leads me to think that I won't either in the dream. (I don't know if this is making sense, but it should.)

The same goes for other skills, such as golf, understanding German, doing multi-variable calculus, anything that I myself can't do IRL. Does this mean that there's a limit to what you can do in a LD? Any enlightenment on the subject? By the way, I don't mean "training" in a dream to learn a skill. I mean conjuring a skill in the dream by using active control.