Id recommend any newby to watch wagga on utube, watched a lot when i started. They're all handy to be fair.I don't think there's a need to spend the money. The information is all available for free. You just need to watch the videos, try to recognise the good ones and copy them exactly before putting your own slant on it if you wish. There are good and bad ones. Practice for speed, efficiency and quality results. Never close the mind to trying different techniques. When you try them give them a proper chance to get used to them, not just a quick go.
Most of us are self taught, I'd say. It's not difficult. It's all about thinking, practicing and being thorough.