To do a cold blueing job you have to remember some simple rules. The metal has got to be clean, not just pretty clean I mean no oil, rust, old blue , finmgerprints ect. If you can clean and degrease the metal like that, and remember yo use gloves when handleing and applieing the new blueing you may get a marginal blue job. BTW can ypu totally disassemble your firearm? It has to be you know.
With all the detail you have to remember and the time involved I would take it to a pro and get it done right the first time, BTW cold blue don't last near as well as a good hot blue job either.