Well, it's more like - if you can afford 1:1 instruction and find a teacher whose style really fits you, you can really speed up your learning. I've experience

Well, it's more like - if you can afford 1:1 instruction and find a teacher whose style really fits you, you can really speed up your learning. I've experienced this with guitar. Self-study can be done but you really need a coach who can push you further than you think you're ready to go, along with tailored instruction. You'll make years worth of progress in months this way.