Has anyone done a TEFL/TESOL course? What are your experiences?

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After taking a career break to look after my daughter I'm thinking of re-training to teach English as a foreign language. It's something I've always wanted to do, despite never having taught before in my life and not really knowing if I'd be any good! I love languages and my daughter gradually learning to speak has greatly interested me and inspired me to look into this again. Have you done a TEFL/TESOL course or something similar? Would you recommend it? What did you do with it?