This is not original work, I'm simply consolidating what Ron (HBR), mdawley4, Artric, mikemo and others said and tacking on a bit from my experience doing the repair. Special thanks to kennysmith who generously sent a pair of the Digikey switches to me for free!
Tools required:
Gas Pliers wrapped in electrical tape
#2 phillips screwdriver
Medium flat screwdriver
Socket wrench with:
10mm socket
12mm socket
Socket extender
Optional Tools and materials:
Soldering iron
Solder wick or solder puller tool
Solder
Materials required:
2 units of: Digi-Key - CKN9954-ND (Manufacturer - KSA0M911LFT)
Digi-Key - CKN9954-ND (Manufacturer - KSA0M911LFT)
OR
1 unit of: item 011 here:
Honda button board from Majestic for $25.34
Instructions:
1) Save radio station presets.
2) Disconnect battery negative (-) terminal.
3) Remove 3 phillips screws from lower column cover.

4) Pull hard on the bottom of the lower column cover to release the clips that hold it on. There are only 3 screws, if it won't come off then pull harder.
5) Wait 15 minutes for the airbags to become safe before continuing.
6) Remove 4 12mm nuts from the steering column support and gently lower the column, avoid scratching the gray dashboard plastic which will be the only thing supporting the steering column.

7) Remove Screw cover from right edge of cluster trim using gas pliers wrapped in electrical tape.

8 ) Remove 3 phillips screws from cluster trim, 1 from far right and 2 from under the sun screen over the instrument cluster.
9 ) Pull instrument cluster trim off starting at the right and allow it to hang on it's wires.

10) Remove 4 phillips screws from instrument cluster.
11) Remove 2 (3 on CVT) cables from the back of the cluster by pressing down on their releases and pulling. This frees the cluster to be removed from the car.
12) Pry apart the 6 catches from around the semitransparent white cover and the 1 catch in the center using a flat screwdriver.
13) Remove 1 screw from button board and unclip the board. The clips will break, remove any loose pieces to avoid rattles. (see thumbnail of circuit board below)
14) Unplug the board.
15) Either solder new switches on or discard the old board. If soldering switches in, pay careful attention to the height, make sure the button top is at the same height as the original buttons, if using the Digikey switches, there will be about 1mm between the switch body and the board.
Assemble in reverse order and test. Metric/english must be held several seconds to change. The maintenance reminder is reset per this procedure:
InsightCentral.net - Honda Insight Maintenance Information
The original long thread is here:
Trip button doesn't work