Anatomically, a turkey is just a really big chicken.
I butcher for 4 families around here, start to finish, including packaging for the freezer.
I took a fat log round, put two nails into it about 2 inches apart, and that's my beheading setup.
Put the chicken or turkey head between the nails, pull on its feet to stretch out the neck, and lop off its head with an axe or machete.
Let it flop to get the blood out for a minute or two, then dunk it in a scalding pot... 140 degree water with a couple drops of dish soap in it to soak the feathers well for plucking.
Peel the feathers from the back to the front, and they'll All come off pretty clean.
Two slits to open the bowels, then connec the cuts, avoid the butt glands and the pooper.
Pull out the innards, get the gizzard by the neck, trim it up a little, then put it on ice to chill it quick.
A chicken takes me about 6 minutes plucking by hand, 4 with a plucker.
I rest the carcass in the fridge for 3 or 4 days, then it's ready for cooking.
If you're freezing it, wrap it up and freeze it right after butchering.
I love food saver vac sealing my meat. Keeps it fresh much longer, and i can marinate right in the bag when i pack the birds for the freezer.