Be organised and have your stuff ready and serviced....
When I worked on the boats, I and the captain would just sit there for a few minutes as the folks gatehred there gear prior to boarding. We would just observe and see whom was doing what and how they were organised. ... The ones that *****ed a little about bringing that big dive bag were the ones that gave us the most trouble. Not bad but they took up a lot of space, setting up was a hand holding affair. The good ones set up prior to boarding, and bring only what they needed for the day. Lunch, dry cloths and a save a dive kit.
We looked for the chatty one whom just wantd to talk and not set up. and when it came time....they were the last ones setting up and taking up alot of room. and forgetting the tank, weight belt and even there papers for travelling. they sometimes became agressive because of frustration...and on a smaller boat...is not acceptable. ....some of them are just starting out and just want to have fun.
On average...there were more good than bad and the bad ones were not so bad once they got organised.