I don't speak 1 word of Chinese, Mandarin or Cantonese, but I was as in SSP (my first time there) today
It's like everything, practice makes "perfect".
I don't know that place but few ideas and others can add many more:
* Prepare your list A, then if busy B, ....with 4 or 5 nearby...so that LB does not rush you to the nearest door unprepared as you have several backups.
* To start, better go for ladies that are well known (therefore are used to see foreigners knocking at their doors) and value their reputations. This way, you can learn the codes, the prices, their protocol,....
* READ Reports posted in the Walk-Up section as well as the Guidelines and you will learn a lot.