Ok first...congrats on your first pulled pork attempt! I mean you have 3000+ posts, but you know...better late than never
It won't take you nearly that long if you bump the temp a little and wrap with foil. What grate temp are you aiming for? Honestly, don't be afraid to go a little hotter with it. I tried the hot and fast method with pork butts after seeing
@jcnaz do it, and haven't looked back. Seriously, it will shave hours off of your cook time and the results are still excellent. Injecting will make them even better, but not necessary. Just make sure you have a good thermometer like a Maverick or a Smoke and you'll crush it.
Find butts about the same size if you can. 7-8lb range is about where you want to be. Once you trim the fat you'll be about a lb light. Who is eating? Kids? Professional football players? I'd say about 1/2 lb per average person sounds right, especially if you have appetizers and sides. If people/parents are bringing food, you'll be just fine with 2 butts. Snake method on a...22" kettle? Two butts will fit and cook well.
PM if you want the lowdown on hot and fast and further suggestions.