When I signed up for the CELTA course in Auckland , I was warned that it would be difficult. True enough, it was!
During the CELTA course I learnt many new teaching techniques as well as refreshing some I was already familiar with.
The best thing was successful completion of the CELTA course, as it gave me a feeling of achievement and the confidence to be an effective English language teacher. If the course was easy, then I think trainees would not get a true understanding of what is involved in teaching English to foreign students.
Since completing the course, the qualification and confidence gained has given me a better chance of succeeding in my chosen career.