Confused about HSI Futures expiry and rollover

Hey everyone,

I've been dipping my toes into Hang Seng Index futures ($HSI) lately, mostly paper trading, trying to get a feel for the liquidity and swings. One thing I'm still a bit fuzzy on is the expiry and rollover process. I understand it's usually the last trading day of the month, but then I see people talking about rolling over before that. Is there a general consensus on when the best time to roll from the front month to the next is, or does it depend on volume/open interest of the specific contracts? Are most of you closing out the old contract and opening a new one manually, or does your broker automate some of that? Just trying to avoid any nasty surprises or getting stuck in illiquid contracts. Any insights from those who actively trade HSI futures would be super helpful.