thanks for all the replies. i got it out today. thankfully, although the tooth was horrendously rotten (the cavity had reached the nerve), it had not affected the tooth next to it.
most of the clinics were fully booked, so i ended up going to dr jude leung in central on a colleague's recommendation. their schedule was full when i called, but when they found out that i was in pain, the receptionist worked something out and managed to slot me in.
dr leung speaks both cantonese/english and was very reassuring and professional, setting out the possible options (while recommending extraction), explaining each step of the process, and enthusiastically showing me the manifold flaws of my teeth.
like fiona's, mine was straightforward: examination, x-ray, injection of gums, yanking for a few seconds, tooth out before i knew it. it didn't hurt, although the injection was rather awkward and i could feel the rigorous pulling of the tooth through the anaesthesia. was made to bite on a cotton piece for half an hour, and have since had dinner.
cost: $1,000. was quoted $800-$1900 over the phone by different clinics (upper teeth are cheaper than lower ones). was also told by another colleague that i can get it done in tuen mun for $500 - an option i'll consider for not such a painful case.