If you're serious about learning something, sit down and spend time with the person who can teach you / walk you through the process. It's 1000x faster. They have leverage, you pay them, then you get leverage.
Learn the foundational skills, outsource what is not foundational.
If our economic development as a species has shown us anything, it's that specialization is the best leverage we have as individuals and groups. When someone has invested the time and energy to acquire skills or knowledge, they have put in work and exercised opportunity cost. Cost of what? The ultimate resource: time.
Some things require you to stumble around in the dark. You have to figure them out for yourself. It's in the dark where innovation happens. It's not something that can be taught because it's not something that has been done before. You'r creating something new.
So whether or not to learn from someone else (and how) comes down to whether or not the outcome you desire has been done before or not. If you want to make something new, there's nobody out there who can 'walk you through the process'
If you want to create something that already exists, learn from someone else. If you want to create something new, learn yourself.
Worth noting: this doesn't work in business because with every 'copy' of someone else's process, there's a dilution of the scarcity in the market.