Galvanized water supply: replacement effort

Hi again,
our property has galvanized water supply lines, it is a 2 story double with a basement. there is one bathroom with a shower, toilet, and sink on the second floor, and there is one kitchen with one sink on the first floor--of course. No bath on the first floor.
For those experienced with the task of supply line replacement, what cost should I expect if I call in an expert to do the job?
In a way, this seems like an easy job to me, I have replaced many water fixtures, on/off supply line valves, and added water fixtures to my current home for outside use. Should I attempt to replace these supply pipes myself?
Thanks, again, Fish
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"> our property has galvanized water supply lines, it is a 2 story double

Estimates are free. To save money, I used cheap local labor to do all the ditching, then got plumbers' estimates for the copper piping job, awarded a contract, then left the ditch and pipe exposed for a week to make sure all joints were leakproof, before burying the line.
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The lines i am talking about are in the house, not in the yard. when you say 'ditching' are you refering to inside the drywall, or in the yard?
Fish
On Sun, 20 Nov 2005 14:09:22 -0800, "Roger Taylor"

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meant primarily the line from water meter to the house connection, so mentioned ditching. We didn't have any interior pipes replaced, only the main supply line, as the inside hot water lines had been upgraded to copper by the prior owner, and the cold water iron pipes are nearly inaccessible, and still running at good volume. About all you can do is once you have a clear understanding of where all the existing lines are, get several estimates from plumbers that friends/neighbors recommend, and ones that Better Business Bureau has no reports on.
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