Rub the butt with a combo of paprika, chili powder, brown sugar, granulated garlic, kosher salt, cracked pepper, ground cumin, and cayenne pepper. I just eyeball it, but generally use heavier amounts of the things I listed first, and less amounts of each as you work down that list.
Smoke or grill indirect at around 225-250 degrees. Make sure any type of fat or a fat cap is on top so it melts down into the meat. Take off when it reaches an internal temp of around 190-200. Let rest for a few minutes then start pulling.
Also, if you do smoke it, you only need to do so for the first couple of hours - then can move to an indirect grill or even the oven. It won't pick up any more smoke flavor after the first few hours.
Have fun, it's about the easiest thing you can possibly smoke, so it's hard to screw up.
This post was edited on 2/4 at 4:00 pm