From seaside or city hall on other side. Both side end with T crossroad, no way to miss anything 😉

A few of them know a little bit of English. But they are used to visitors trying out things, and they're happy about it. So, no worries.

Some great suggestions already sent for you but if you Google "fireworks in HCMC on new years eve" you get a variety of good advice & options. The streets will be absolutely packed & just walking around could itself be a challenge. If you do walk about on NYE, make sure you keep your hand on your wallet & take care of your bags (as you would in any big city in the world)! Happy New Year!

I do not think there is a set time. The fountains are not the main attraction. People watching is every night, with lots of restaurants, bars, coffee shops and milk tea stores. There are often events here too.