Please, please take it from my DW and me, to not cut it close. Figure out some way to get there earlier. We did it ONCE and never again. We arrived at the terminal and there was only one baggage person there, only one person at a counter, and we walked up the gangway, and they literally left moments later. It took us the night to calm down! Ever since, we make sure we are in port the night before. That may not be an option for you, but try to get there earlier!