The very first pull you take should be on a piece of vinyl that's been firmly secured with tape. This is so we can line up the placement of the image.
A good t-shirt graphic is three fingers from the collar for shirt sizes small and medium, four fingers for large and extra large. You can use a piece of tape to mark the center of the shirt. If you don't care how it's centered you can just eyeball it.
My piece of vinyl was dirty from previous print jobs before this demo (hence the foggyness of the image).