Yeah, I'm curious too...
From what I've picked up, I would spot meter (using the handheld) the brightest area, e.g. white cloud in sky, which gives the exposure for mid-grey, then shift that exposure to the right, e.g. 2 stops, to make it the brightest object without clipping.
As above, it sounds like this could be done via spot metering with the camera, but I'm going to give it a go anyway!