I can understand where you are coming from peach_blossom, like many of the fellow geoexpat members on here, I think its good that you feel nervous to an extent - re-locating or consideration for a permanent work place can be how you say tedious and problematic, but I would assume it is just a short term feeling you have. There's so much stuff you could do here, its ridiculous sometimes (in a good way).
I was more or less in a situation that was similar to you and I used to come to Hong Kong for holidays and stuff, to get more of a feel and to re-emphasise why in the future I would consider working here. This time round, I came back on my own - needless to say my parents are abroad still, and its been one crazy year so far. I didn't have a lot going on at first (unemployed, accomodation concerns etc etc) but after a while you start to meet people who would like to help you out, like people who helped me find my first job here.
It seems like you have all the tools, so go have fun with H.K.!