Countrygirl, you should have a good cook, with all the info. you have gleaned from the guys,it'll be a snap. Remember to go from cold through the 40* to 140* zone in less than 4 hrs.;at 250* to 300*f, the skin will most likely be crispy for you.
Raptor's "butter under the skin" is a great idea;and if you like /want to use a Rub,mix it with butter and it gets a better coverage , easier and more even coverage on the Breast and inside the Bird.
Hope you have a marvelous Thanksgiving and ...