What it comes down to is spending time getting your hands dirty making things (or getting real practice), even if your output sucks for a long time. (And it will.)
Favorite personal example: One day, when I was around 19, I decided that I wanted to be an artist. I hadn't seriously drawn anything since I was about 10. My current skills were atrocious, but I started drawing every single day, anyway, undeterred.
Of course, at first I was awful. But I copied old master paintings, drew pictures of famous sculptures, etc.; all of my free-time, I spent drawing. And slowly, but surely, I got better at it. I did this every day for probably about 3 years or so, and by the end of it, I was very accomplished. But it was a constant effort that took years. I probably did over 1,000 drawings, hundreds of paintings, and so on. And about 90% of them were awful. But the good stuff, it was really really good. I guess that's the price sometimes. Nobody is a genius all the time. Even Michelangelo, or Picasso.
The thing is, if you find something you enjoy, it doesn't feel like work or drudgery. (Even though drudgery is the only way to get better.) Instead, it's an activity that you want to spend time on, and when you do--time passes so quickly you don't know where it went. It's like living life on fast forward. (Maybe that feeling's the real-life inspiration for the old trope of the training montage. A deep kernel of truth beneath the fantasy, after all?)