Combine spices in a small bowl and rub onto pork. Cover and cook 7-10 hours on low. My 4lb pork shoulder took about 8 hours on low.
Remove any fat that's accumulated on the top and pull apart pork with two forks until shredded. It should shred very easily if done.
If you want to remove the pork and then reduce the sauce in a separate pan you can. I usually just shred mine in the accumulated juices and serve.
I just made this tonight and IT WAS AMAZING! The BBQ sauce was delicious. Had this on cassava taco shells with goat cheese, black beans, and chopped cabbage. SO GOOD!