I lowered the air pressure 10 lbs from max and never had a problem. I would regularly ride across the lake and the studs worked perfectly. Not alot of fun on bare pavement but knowing that you are not going to slide out is a real plus when commuting to work.
Find a good icy patch in a parking lot and give it some practice. Bring along your pump and try the tires at various pressures to see what works best for you.