While I haven't changed the timing belts on a Honda, I have changed the timing chain on an old Toyota. PITA is an understatement. I had to pull the front motor cover to do it, but really should have pulled the head for the gasket to fit right. I managed to do it without leaks, but what a pain. If you don't have to pull the head, it shouldn't be too bad, though. Make sure the valve train and crank are fully in time when you button it up, though. (Usually it takes two cycles to be in time but may appear to be synced after one.)