It is not easy. Apprentices have many pits, and then even if they find real shops, they mostly do odd jobs. It's hard to learn a lot. If you want to be a bartender, it is more reliable to find a professional school. There are not many good schools now. If you want to find it, find a professional. Horizon Bartender School is good. There are classmates who know their school in the bar, which is quite professional.