I think the key here is that you only deliberately practice things that you really, really want. Things that you want so bad that you obsess over them and you wake up realizing you've been dreaming about them. I quit a comfortable software job to take about 9 months off to devote to piano recently. Every free moment I get, I'm throwing myself in the waters. It's really hard to push through the painful points of learning stuff if you're not obsessed.