cgeorge, All I wear are Browning 800 gram thinsulate/gortex boots. If my toes get cold I pull a pair of toe-warmers from my pack and activate them, slip off my boots and slide them between my wool socks and my polypropolene liners. I'll do this sometimes even before I go out.
I've found that its best to keep these warmers in the 'pocket' just in front of the ball of your foot, under ur toes. If you get them too far back,they can start to hurt your feet when you walk. Be sure to get the toe warmers cause they need less air to keep them going.
Also, I hate wearing gloves and I found an old Jone hand muff at a yard sale one time. It has a little pocket in it for a handwarmer. Keeps my hands warm and comfy until its hammer time.