Route to Limbang via Brunei

A friend wants to drive to Limbang end of March. Though I’ve been there a few times but since I followed other’s car and always fallen asleep throughout the journey so don’t really know the exact route. I only remember need to make a U turn into smaller path, then into quite winding kampung areas what a few junctions. Anyone who’s familiar with the direction and is willing to share the info?
Thousand thanks!