Self taught nail technician vs. Beauty school | Is it possible to learn manicure by yourself?

Is it possible to learn nails by yourself or is it necessary to take a special professional class?
I’ve been on both sides so I can share both experiences with you.
In some countries (the U.S. for example) to get a permission to work as a nail technician you need to get a license. So you need to attend beauty school firsthand. They usually tech basic skills like salon safety, product application, manicure, pedicures. 
But what’s next? Clients ask for ombre, chrome nails and nail art.
Is it possible to learn all this nail art techniques by yourself or special class is the fastest and easiest way?
My opinion is that it all depends on a particular person.
Some people are stubborn enough to repeat things over and over until they see the result. But usually taking a special class is a lot easier as educator can see your common mistakes and give you valuable advice on how to avoid them in the future.

What do you guys think?
Did you take any special nail art classes or you've learned everything by yourself?