i use a woman who used to be a lifeguard at the sai kung pool. she's great! she speaks a little english and she uses games and toys to motivate young learners. i told her i didn't care about the "strokes" etc, i just wanted my boy to be less terrified of putting his head under... by the end of last summer, he was swimming to the bottom of the deep pool to retrieve toys! (he was 4.5 yrs).
my daughter has started with her this year and my son will continue.