Hello Fazer,
Brownells sell furnaces, and the necessary crucibles, bone and wood charcoal. They have a downloadable 'guide' as to 'how to do it'.
However, they show no pictures of the end results they have obtained and they don't offer any guarantees on you getting results, or even they got any. I'd be very wary of going to the temperatures recommended by Brownells they seem a tad too high for my liking.
There is a very good CC Hardening thread (22+pages) in the Marlin Collectors Website, gunsmithing section, complete with photographs of results. This really is an excellent thread and very well worth reading. See:-
(You need to Login or Register to view media files and links) It's not cheap setting up to do CC Hardening and you will need other items of equipment than than the basic furnace, crucibles and charcoals.
Be very aware that only a few steels can be CC Hardened, try it with the wrong steels and you have a potential grenade looking to shatter when you touch off a round.
You would need to do a lot of experimenting with various techniques, different charcoal ratio's, different temperatures, soaking times and quench temperatures before you risk working on an action that may cost $1,000,00 or more.
Harry