Previously on HAL I would give my room steward, waiter and asst. waiter something at my first meeting with them and explain there was more at the end of the cruise and then hand them more at the end if appropriate.
This always worked well as they already knew they were getting something. The service seemed to be better than what it otherwise would have been. And that I'm willing to pay for.
I will still give the advance but I will miss distributing the tips at the end of the cruise. I haven't decided whether to have it removed from my room chit and follow my old routine.