Buying full wings, instead of "party wings" that are already separated, is a good idea for a few reasons--they're cheaper on average and you'll also have a bag of wingtips at the end to add to stock. Use kitchen shears or a decent chef's knife to cut through the joints. Feel down the wing and find the two joints on either side of the flat--where it wiggles is where you cut. Snip or chop right through the knuckle and that's it!