I am on a tourist visa but am working and have an apartment.

My employer has been lax in getting the work Z type paperwork started. Chances are I will need to go to Hong Kong to get my tourist L type extended because of this situation.

What should I prepared for, questions they will ask, etc. I need to be prepared and have no idea what I will face when trying to get the visa extended. Will it be difficult and I certainly don't want to lie or mislead.
Thanks