This has everything to do with where the seam is going to be. I don't care how good you are, you cannot install a seam across the middle of the room and have it unnoticeable, especially with most residential carpets. If the seam is off to the side of the room you would be able to get away with it.
It would also take a while for the new carpet to blend in with the old, as the old has most likely faded over time.
Do you really need to change the carpet, though? I would think that you could pull the carpet, dry it out, replace the underlay and re-install the carpet. I've done that a number of times with flooded carpet, but usually for basements. A good berber holds up pretty well to that kind of abuse.
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