How hard is it to become a taxi driver?

Pass any required tests. Most municipalities, even if they do not have required training, do have a required test. Applicants are often charged a fee to take these tests. They vary in difficulty from “The Knowledge,” the London cab driver test that typically requires 2-4 years of study, to less daunting exams like the Washington, DC taxi driver test. If there is no training course, then the city will typically provide a study guide to help applicants prepare for the test.