if OP has not much experience, only a CELTA, I understand it is ... tough.
well it is only a 'gateway' qualification, a bit like passing a driving test and then really learning how to drive afterwards.
As to CELTA! Sorry, it is no big deal as a mere certificate any English native speaker including "chavs" can prepare and pass within a few weeks for a little money.
well that is not even true. What is a 'chav' anyway? In my (extensive) experience the majority of people doing CELTA have a degree.
If your language awareness is rubbish, or you cannot deal with people, you will fail the course.
I can honestly say that my 4 or 5 week CTEFLA course was the hardest month of my life and cost the best part of a grand.
I don't know why you are so chippy about English teachers. Is it because nobody really wants to learn French any more?
Yes, what is a 'chav' please InPolska??