1. slice from breastbone to pelvis (gut hook works nicely here, but a finger each side of blade suffices). On a buck (lucky you), just pick a side.
2. roll on side and spill/take out everything below diaphragm. Large intestine/bladder will still be attached (more on that later).
3. Slice diaphragm, reach up in, and find "the hose". Cut trachea as far up as you can reach, and pull down and out (can run knife along back of the trachea, but I never have had to).
4. Cut around anus to fully detach (some tie off with string, again, never had to). Grasp intesting from gut cavity area, and it will pull in/through. Usually, bladder comes with it.
DONE! That simple. Hang to drain.
Note: some cut the anus first, but I prefer to use the clean knife up top first.
Many variations on this, but that is how Dad taught me.