My son wanted to try some expandables, so I purchased some Spitfires over the weekend. They come with a screwdriver and instructions on how to set them up. Even the sales person said "they are a little more difficult to set up than fixed-blad broad heads". However, they seem to be good to go right out of the package. Am I missing something here? Do most of you just screw them in and shoot them as they are, right out of the display box?