You need to check the oners manual to be sure, but I think that since you have a V-tech engine they don't need to be changed. This is what i saw on the dealers maintenance schedule.
Actually, the plugs should be replaced at 105,000 miles according to the owner's manual and the dealer.
7/2009 : it took me around 1 hour to change all 6 plugs - it's not that bad. Get yourself a good socket wrench (I used a T shaped spring handle from pet-boys). GENTLY unplug the coil wires - do not pull on them. Use an allens wrench to take off the coil bolt. Remove the 6" coil. The spark plugs are deep down inside. I always put some anti-seize lubicant on the plugs. The owners manaul show ssmall diagram how to do it! I used NGK "id-rid-ium" plugs - Ike $6 each at pep-boys. The dealer wants $225 to do the work.
According to Honda, 105k miles. The maintenance schedule is at the link below. http://techinfo.honda.com/rjanisis/pubs/OM/OD0101/OD0101O00236A.pdf
Follow the directions in the owners manual provided by Honda.
Standard spark plugs, 50000 miles. Platinum tip spark plugs, 100000 miles.
120000 miles with original iridium plugs.
change the plugs at 60,000 miles.
Change the plugs at 100,000 miles or earlier if the engine is not performing as it should.
platinum plugs 75,000 miles. resistor plugs 30,000.
Recommended change is 100,000 miles
100,000 miles according to the factoryspec.
100,000 miles.
50,000 miles.
Every 30,000 miles except platinum plugs