Having said all of that I would get an oil pan heater, which is easiler to install. Visit the Wolverine oil pan heater website, and they will explain better than I can the advantages of warning up the oil. Either way block heater or pan heater you are doing a good thing for the engine! JMO
Or get both. Oil pan heater is very easy. However, having installed block heaters in all my cars, I can tell you that the Honda is not that hard to install. Rather than installing into a frost plug, which is hard to hammer out, the Honda block heater screws into the drain hole for the block. All you do is unscrew the large (block heater sized oddly enough) drain plug and screw in the block heater in it's place. If you're quick with the swap and do it when the engine is cold, you don't even have to drain the coolant.