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I have to remove and install a new floor harness in my 1999 Civic Si (Canada) and was wondering if anyone can give me a little help on how to start. Thanks in advance.

 
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I'm about to do the same in mine since I'm swapping in power windows.
You have to remove front and rear seats, center console for a start. Then remove the bottom trim parts on both sides to remove the carpet. This will take care of part of the harness.

After the hard part, or should I say long part.

You have to remove the dash to disconnect all the connectors under there.
Here's a nice DIY I found to remove the dash (go down to post #12)
http://honda-tech.com/showthread.php?t=2500737

I think you can take the dash out without taking off the steering wheel. (he was changing his for another one that's why he took his off)

You also have to disconnect the connectors for the doors, to do that you must remove the front fenders to have easy acces to the connectors which are on the door itself.

Haven't done the dash part yet but everything else I have done.

What part of Canada are you from?