I tend to do a variation of Richards version (mainly because I'm working with film most of the time)
I'll manually meter for the ground, then for the sky, and find the difference between the two in stops - if it's (say) 3 stops brighter on the sky, I'll use a 2 stop ND (we're used to viewing the sky as marginally brighter than the ground). Fit the ND in place, finally compose/focus, and re-meter (allowing the ND to take care of the sky). Hit the shutter remote and hope I've got it right all the intervening time until the Velvia comes back from Peak Imaging.