in my opinion enroll yourself in any swimming classes, sometimes even with resources from books, video & etc is just not enough for you to get it correctly unless you are a genius or you can spend some (maybe a lot) time in the pool trying to imitate other swimmers

when you swim try to inhale using your mouth & exhale using your nose, this can stop the water from entering your nose

i have swim recently in presint 6, heard there is 1 public pool in presint 16 but haven't really been there b4

the facilities there are well kept & clean in presint 6, the pool water also gives less irritation to the eyes due to the different type of chlorine that they use there

yup, its a public pool, but i am not too sure bout the opening hours