Ya'll I started using this technique a few years ago and it has been a Godsend.
I swear I saw if on the F Word.
Take the turkey, and slide your hands around the skin over hanging the neck area. start with your finger and make a small pocket with your finger between the skin and meat. Do not break the skin.
As the pocket forms, start to increase the size of the pocket by making a circle motion with your finger, then you will be able to slide another finger in and then evetually your entire hand, seperate as much meat as you can from the skin without breaking the skin.
I use a stick of soften butter and add my garlic, onions, salt, pepper, herbs, etc to the butter, fill a piping bag or ziploc bag, cut the tip
Insert the bag as far in the pocket as possible and start pipping the butter blend in between the skin and meat. re-position the bag as needed, to coat as much as possible. slowly work your way around the bird.
Once the entire bag is empty, i work out any lumpy spots and kinda move the butter around to other places.
Then I slather the outside of the bird with about another 1/2 stick of butter, and all the seasonings also.
This way the flavor roasts into the bird and keeps it so moist with that entire stick of butter inside of it.
I'm actually going to prep my turkey tonight, as we have T-day lunch rather then dinner. Will post pics later .