Keep a healthy degree of fear - those who don't are the ones who are likely to have a shorter lifespan!
Learn as much as you can and develop your local knowledge whenever and wherever you can - it can make the difference between safely getting the job done or not - and might also get you out of a pickle one day - or many days...
The flying is awesome and some days you'll love it - other days you'll wish you hadn't got out of bed.
Don't always expect things to happen the way they should (eg. just because there is a Jet A tanker cart at Kiunga and although you have phoned in advance doesn't mean it has fuel in it and the tractor might be broken too). Be a thinking pilot and think for other people (like ATC) as well as yourself!
Don't underestimate the weather - it usually takes most new pilots quite some time to get used to it and its changeability - it's normal! Always respect it and don't ever expect it to be the same from one mile to the next or one hour to the next and certainly not one day to the next.
Enjoy the experience and remember there is a lot more to PNG than old Moresby. Mostly the bad stories get out but you'll see that it is not ALL bad and there are plenty of nice people as well as the ones who see walking dollar signs when they see you...
Lastly, the aviation community up here is even smaller than Australia so if you want to be the pidgeon - remember that you will also be the statue - perhaps sooner than down south. In other words - be careful if you want to start burning bridges!