If you're just learning it for your own pleasure, it doesn't matter as long as you feel that it is powerful and effective. True, you won't learn the perfect way to hold the weapon, and it will be a bit clumsy against someone who knows what they're doing but if you just want to learn for fun, try books and making stuff up. It is true that you will develop habits that experienced people will think are bad, but you're doing it for fun right?