Pat your pork dry. Rub it generously all over with barbecue rub.
Spread half of the garlic and rosemary evenly over the top half of the meat, pressing in. Then flip the meat and repeat with the remainder for the bottom.
Wrap the prepared meat in a layer of peach butcher paper, and place the prepared pork butt in a disposable aluminum pan, fat side up.
Add the pork to a smoker set at 190° for 18-20 hours.
Half way through the cooking time, pull the pork butt out and wrap the pan tightly but carefully in aluminum foil. The juices will be HOT.
When the pork's done, CAREFULLY remove it from the smoker using potholders. Juices will be HOT and can cause burns and the pan will be full. Let it rest for 30 minutes to an hour.
Remove the foil, and remove/discard any visible chunks of fat.
Carefully remove the pork from the juice filled pan, and transfer it to an XL cutting board. You may have to do this in sections if the pork is so tender that it falls apart while picking the whole thing up.
Using a pair of meat claws, or two forks, shred the pork- removing any fat as you go. Transfer the shredded pork to a serving dish, and reserve the juices.
When all the pork's shredded, mix in some of the juices (as desired) so add some moisture to the meat. Once it's to your liking, discard the remaining juices.
Serve on buns or as is, pair it with your favorite barbecue sauce, and enjoy!