What kind of finish are you planning? Hot blue, rust blue, or? (Rust blue is one that Harry Homeowner can execute without enlisting the services of a professional.)
Exactly, rust blue is the method of choice. I've done various small parts and a muzzleloader. The biggest challenge was finding a tank big enough to boil. I ended up having the local welding class students make one for the cost of the metal. Perfect size for a barreled action.
