What is the process of becoming a lawyer?

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I know that you earn an undergraduate degree and then go to law school, but i really am not familiar with the time between graduating from the undergraduate to when you become a fully paid, licensed lawyer. Is the 'internship' payed? When does it take place? How do you have enough money to support yourself during this? Is law school (including the internship/expierience thing) difficult? By that i mean, if an average person put in a large amount of effort, would they sucseed?

What is the process of becoming a lawyer?