I've had the time of my life.

The training weeks in Beijing were the most valuable lessons you'll learn. Not only because you're being taught by competent teachers who'll give you plenty of advice but also to slowly get used to an entire new country.
The training weeks offer a safe bubble for you so that you can grow more and more accustomed to the Chinese culture without experiencing a too big of a culture shock and neither will you have to experience them on your own.
Everyone is in the same boat and is dealing with the same difficulties and that creates a sense of unity. You'll form great friendships during training as you sit through different classes from day to day and will also have time to explore the city.

Once you are at your placement you will more confident and prepared than you were upon arrival a month earlier and soon you'll find yourself in a routine of teaching and travelling during the weekends. Both of which are equally challenging but enriching.
All in all you will need a lot of patience and will experience great language barriers but all this makes it a great experience. One you’ll never ever forget.