1 - Keep your backpack as compact as possible. This will decrease the chances of it snagging on the branches of the thicket that you will have to push through and bumping into the sides of the rock as you inch your way along the narrow ledges.
2 - Try and keep most of your water towards the centre of your backpack. The more compact your backpack is and the closer the mass of the weight is to your own centre of gravity, the more agile you will find yourself. Try to ensure that your backpack does not become a hindrance.
3 - Bring gloves! Not only will they keep your hands warm but they will also serve to protect them from the nasty sword grass that you will encounter along the way.
4 - Treat hotspots on your feet (by strapping them up) as soon as they make themselves known. Nothing can ruin a hike like a bad blister.
5 - Layer up. The Stirling Ridge can be both warm as well as very cold. Ensure that you have clothes for a wide range of temperatures.
6 - Water-proof your bags. The Stirling Ridge walk is a very exposed hike that can get a lot of rain. The lingering moisture in the air was enough to leave my goose down sleeping bag damp, which left me much colder at night than I would have liked (since down loses its insulation properties when wet). The same thing goes for clothes - Keep a pair of clothes that are always dry just for sleeping in.
7 - The book by AT Morphet, 'Mountain Walks in the Stirling Range, Part 2' was useful on more than one occasion.
8 - Bring a GPS unit (and don't forget extra batteries or an external power bank). If you do not have access to one, at least make sure that you have a comprehensive map of the area and a working compass (and that you know how to use them).
9 - Know where the two escape routes that lead northwards are and know how to get to them. The first one that leads down the North Mirlpunda track can be found at the First Arrow, and the second one that leads down the North Isongerup track can be found north of Moongoongoonderup Hill.
10 - Make sure that you aim downwind!