If they've turned orange then they're probably ready. I leave my pumpkins/squashes on the vine until the leaves die back, then cut the pumpkins leaving the stalk and a cross piece of vine to make a T handle. If you want to store the pumpkins they'll need further ripening in the sun so that the skins toughen up, just leave them in a sunny spot but make sure you bring them indoors before you get a frost.