There is a lot of variance in the amount of work involved, but as a general rule:
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Get a Bill of Materials so you can independently quote them. I did buy all the materials when I did put my wired Ethernet home network.
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Estimate about 1.5h per port x 2 folks x 45usd/hr. The amount of total hours spent and the amount of people they need to bring (they would at least need two) are the next big thing. The hourly rate depends on your local labor market.