How likely are you to secure booking during CNY? What are my options if you fail?

If possible I'd like to make a few stops on my way between Nanjing to Hong Kong over a period of two weeks, from the 12 to the 26 of January 2014. If it is likely you won't be able to secure all 2-4 tickets, I'd rather go direct and miss out than stay stuck in the middle of China.

How likely is it you fail to secure bookings during the high season and how likely is it I'll have to adapt to other kind of tickets?