They are VERY easy. Not sure on an Accord, but for an Integra....

You take off the panel that hides the screws to the gauges using a flat head.
Take out 4 screws and the whole thing will come out.
Take off another few screws that the plastic cover will come off.
Carefully put the gauges on...the hardest part is not breaking the needle.
Then splice into a few wires and you should be done.

You probably should find out which wire you are splicing into beforehand.