Gifted, frozen, quartered pig?

We've been gifted a total of 21# of new farmer first time pig meat. 2 smaller front legs, 2 larger hind legs, and a ?torso. We're predominantly vegetarian, but having a group of people come through next weekend following a fun run. I have no idea what to do. Brine? No brine? My preference is to make a pulled pork dish. I have no smoker; access to a grill; two ovens at my fingertips. I've only made pulled pork from store purchased butts. Any thoughts or experience would be helpful! Thanks