No one I know field dresses (guts) their turkey unless they are aging the meat. But I guess some people like to try and cook the bird whole (which I'm too lazy to try

). If that's what you want, then you'll need to remove all of the entrails and flush and wipe the inside of the bird clean and dry. Pluck feathers, cut off head, clean skin, tie up legs (before rigor mortis, etc...) Seems like Lots of Work to me...
IMO The most reasonable thing to do is to just take your bird home and butcher it as soon as possible. Some people just cut out the breasts and toss the rest of the bird - which I think is a mistake. I take out the breastmeat and the legs. The thighs are tender and the drumstick (lower leg) is good for soup - when slow/pressure cooked. The wings in my opinion are useless.
MY STEPS
1. Rip out all of the feathers, a few at a time, from the breast, pulling up against the "grain".
2. Push down on both legs breaking the leg/hip bones. The idea here is to get the legs to lie flat with the bird on it's back. This will expose the breasts and legs so you can cut them out more easily.
3. Skin out the breast and thighs - start with a shallow cut, just through the skin at the bottom of the brestbone and work all the skin neatly off of the breasts and thighs (you'll need a very sharp knife to do it well).
4. Cut out the breast meat following the bones and diaphram closely (take your time it'll explain itself).
5. Cut off the legs all the way up at the top of the muscle and through the hip joint (look for the joint and you wont need to hack at it).
6. Cut the feet off of the legs, with lopping shears/meat cleaver.
Brine bath meat overnight, cook and enjoy!
P.S. - I think that gutting a deer makes less of a mess (and with a deer it dosen't look like theirs a pile of snot in there either)...
