The problem with blueing the bolt is that it was never intended to be blued overall.

The top of the "long" RH lug and the very rear end of the bolt, including the bolt handle are all that were blued on the originals.

If you want a fancy "high-gloss" blue, you have to do a lot of polishing before it goes in the tank(s).

Unless you have a bit of experience and the right tools, you may end up with a somewhat "sloppy" bolt, especially if it is already a bit "pre-loved".

Polishing the receiver / body without altering the profile of the edges or "softening" the markings is a bit of an art.

Any blue on the "running" surfaces, (most of the bolt body) will get scruffy in short order.

As for the receiver, if the bolt "raceway" is blued, it is probably less critical: it won't stay "blue" for long.

If you leave the barrel in place during the blueing, you need to be VERY thorough in neutralising the salts that WILL be left behind in the breech thread.

If your rifle is a bit scruffy and has suffered a bit of surface rust here and there, there is an alternative to "conventional" preparation.

Hie thee to a GOOD bead-blasting facility and have them work the pieces over with glass beads at a moderate pressure. Avoid garnet grit at high pressure, unless you want a very matt finish and soft edges everywhere. If your blueing shop has this blasting facility on site, whack it in the tank immediately. If you have to go somewhere else, coat the bare metal with a LIGHT oil to stop corrosion and get it cleaned and blued as soon as possible, preferably the same day.

If you have an exceptionally well-equipped backyard shed, so much the better.