At the end of the day, it's not rocket science working on a PCB, but it can be a little risky, I have never had a close look at the board in the instrument cluster, Some boards use through the board components, some are surface mount, the through the board style components are (generally speaking) easier to remove and replace, surface mount can be a little tricky.
If you have never worked on/soldered on a PCB before, I would suggest getting hold of an old PCB and practice, you have to be quick and precise to make sure you melt the solder, but limit how much heat you put into the component and the board.
Drop the Ebayer an Email,
Ask them how hard is it for an average person to do?
Are you removing bulbs and replacing them with LED's?
Hopefully another DMFer has performed this operation before.