Great question — answering as the UphillTech team:
You are correct that it is called scree. Depending on the incline and rock makeup it can be either relatively easy or almost impassable to cross. If you are traversing you want to pick a straight line across or with a slight "incline" since you inevitably will slide down a bit as you make your way across. I like to have a trekking pole on my downhill side but usually would keep my uphill hand free. Use your trekking pole to lightly test stability of your next step (you don't want to knock it all loose though). I like to take small steps so I can shift my weight in a controlled manner more easily. I also like to think about the "angle" of my foot. I like to keep it "flat" rather than will...
Full answer by noah: https://outdoors.stackexchange.com/a/27470 (CC BY-SA 4.0).
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