If you haven't operated in PNG it would be best to just listen and learn.
You don't need to be IMC to 'lose it' in that place, even though you're visual. It can be quite surprising to find one has no visual horizon due to terrain and need to refer to the AH/AI for pitch info rather than be fooled by illusions. It can all quickly turn to worms in a low performance aircraft.
The only time I felt safe there was departing Moresby to the south or at 30,000 ft in a Canberra taking survey photos.