It's not a hard job. Make sure everything in clean, get it hot enough that the solder flows and a tiny bit more.
Note:
Careful of over heating.
If you clamp it together, which I would, keep in mind the solder will shrink. But don't over tighten the clamp or excess heat may dent the barrel.
Put a heat sink of some sort, even a wet rag on the rib (if it's a vet rib barrel that is) they are soldered on too. Don't want it separating.
Hot enough to move the solder, 1100 degrees will F up you factory bluing. Be warned.
It's a $40-80 job if you pay somebody else to do it. Which may be the best option but onl if you have a smith you trust. Many will say "sure" but they've never done it and don't know the problems they could create. They aren't gunsmiths. They're living a lie. Don't buy into it.