Dave;
As for "tips"...
I use Harry Soo's recipe and technique as outlined here:
http://www.slapyodaddybbq.com/2012/04/slap-yo-daddy-bone-in-pork-butt-2/
I make my own Harry Soo Basic rub as outlined in the PDF from this site.
The only deviation from Harry's instructions is I put the butt (after the bark is set as he suggests) in a foil pan and tightly foil the top. The pan makes it MUCH easier to save the juices. I defat the juices and use an appropriate amount of these juices for my sauce on the pulled pork. That's about as good as it gets. My grandson is a VERY picky eater. After he almost foundered eating my "Cowboy Pulled Pork Sandwich" (plural) I asked him how he liked the sandwiches. He quickly replied, "
AWESOME"!!
I rest my case...
P.S. Bob's suggestion is a GOOD idea. I put the butt on a large serving tray, mentally lay out the butt in a grid pattern and inject about every 1½". I inject a good bit laterally to make sure I have good coverage. You'll find that using a tall, narrow container makes it much easier to fill the injector (I use a cheap plastic one that looks like a large needle). Watch that hole on the side of the needle - it can put injection liquid "over the moon" if you're not careful. That stuff is STICKY (be a gentleman, and don't ask me how I know

)..
Well worth the effort, my friend...
Keep on smokin',
Dale53