I have been teaching English as a Foreign Language since 1997 and trained as a CELTA tutor in 2006. Before this, I trained as a secondary school teacher and taught a wide variety of different subjects in the year after I qualified.
To successfully complete the course, plan your time carefully and make sure you allow enough time to plan your lessons, and really focus on feedback from your tutors and your peers as this will help you improve from lesson to lesson.