"It's an important game, one we need to win, but it'll be tough and we need to be switched on.It's completely different to what we are used to in New Zealand.
"It's a bit rough and tough and the climate has a huge part to play."
New Zealand's last visit to Port Moresby ended in a hard-fought 2-0 win to qualify for the Beijing Olympics.
"The majority of the players have been there now and know what to expect, so we'll be doing all the little things right ahead of the match."
Despite the one-sided victory in Whangarei, Moorwood said the team were aware that there are always things to improve.
"It wasn't a perfect game and there were times we could have been more clinical and notched even more goals than the eight we got. But there positives to take out of the game but it's those things we need to improve that we'll be working on before Wednesday to confirm a place at the Olympics."
Moorwood plies her trade for Chelsea in the English Super League so a ticket to London would hold special appeal for the former New Zealand captain.
"The buzz around the games is definitely getting louder, more so in the last month or so before I left for New Zealand. The village is all but finished and the Games are everywhere you look. The atmosphere is pretty exciting already and London is an amazing city so it'll be a great event.