It's hard to answer. Apprentices are paid to teach without pay, and it's also free. Generally speaking, the technology is immature and they can't make much money. Mainly to accumulate experience and improve their skills. Intermediate and advanced ones are relatively stable. The better the technology, the more money you earn. It's hard to say specifically, it's ok to want to learn. There are many tattoo artists in Beijing, and their skills are all good. Learn more about it online, you have to have a painting foundation, otherwise.