Best way to prepare will be to get up at 2 am (local/body time) then go downstairs and sit in the cupboard under the stairs with minimal lighting for 6 hours, making sure you stay awake!!! If you have a friend who is prepared to sit up with you practice whingeing to each other about:
1. Levels of pay
2. Flight time limitations and the lack of time off
3. How crap the managers are & how little they understand you
To REALLY make it realistic get two empty cans and join them with a piece of string so you can leave one with your sleeping partner upstairs, then periodically speak in to your can, with something like, "kunming,kunming Cathay 250 is overhead KMG FL11400 metres estimating at 49"..........Keep repeating this till your partner wakes up and sleepily replies (tell her to do her best chinese accent)
Do this 3 nights a week till you join and you should be up to the job
PS: enjoy !!!