I also agree that starting off with the Renown Mr. Brown (boston butt) recipe is a great start. I would recommend you start it first thing in the morning and let it cook until it's done. And to keep the worrying to a minimum, don't plan on pulled pork for dinner. You might get lucky and finish prior, but I wouldn't sweat it.
By starting early you can tinker with the vent settings, fill the water pan, tinker with the fuel, etc. as you'll no doubt have to do your first time.
I'll assume it's pretty cold up there in NY so I'd start a 3/4 full Weber chimney of coals and use the minion method to build your fire. Go ahead and use a full ring of unlit charcoal. Assemble the unit and place the lid on a little askew to encourage more draft to build up the fire. Open all vents fully. Insert a thermometer (weber thermo is great) through the top vent. When it hits 225 put the lid on fully. If the temperature climbs much past 250, you might want to shut the lower dampers a little. Do this a little a time as it takes a little while for the heat to regulate.
It'll be very important to block the wind if there's much of a breeze, especially when it's cold. Also, to be conservative on the time, figure 2 hours per pound. You'll want to let the pork rest for 20-30 minutes after you've removed it before you pull. I like to remove the butt when it hits 190 knowing that it will continue to climb to 195 before I pull it.
One last bit of advice, the internal temperature is going to hit 165 or so and stay there for a LONG time. That's normal and is a good thing as this is the time when the rendering of connective tissue takes place.
Good luck and let us know how it works out for you!