Reblueing per se, isnt hard, its just a matter of keeping the salts a costant temp.
However, prepping the gun for bluing is time consuming. It has to be completley stripped, and all parts to be blued have to be polished. Bluing will magnify all scratches and defects in the metal.
You can get a factory or better finish.
Lets explain the hot tank process, or how I do it.
(I dont do cold bluing)
You have four tanks, One is full of hot water with non sudsing soap, to clean the polished partsl. It has to be hot enough to remove all the oil and grease.
Next comes a tank of cold water, (fresh water running through the tank) rensed thougherly then the gun and or parts are put in the blueing tank for aprox 20 mins. The bluing tank has to remain constant between 295 and 300 degrees, too hot and you'll get a red or rust tint, too cold and you'll get a green tint. Then the rifle is put back in the cold rinse, aggitating it to remove all the clumps of salt. Then the rifle is put in a not non soliable oil, left in the boiling oil a few minutes.
After which I rmove the rifle and flood it with WD40 washing off all oil, water etc, then wipe all the WD40 off completely with paper towels. I then coat the whole thing with gun oil. A freshly blued gun is easily rusted so keep the oil on as long as posible, at least until its completely cooled.`
So basicly thats the process I use. Its not practical for one or two guns. Polishing before bluing is the most important part.
After reading this, you can see where I recommend taking it to a good gunsmith for bluing.
(no I'm not in the business any more, I'm not solisting nor will take on the job)
Pardon the spelling