This is not a step-by-step, just a brief overview aimed at pretty competent mechanics ; I could have done with this info to speed up changing mine.   Honda wanted 1.100€ here, parts and labour ; the same Denso DAN985 is available on the net for 246€, it took me 4 hours including making the belt-tensioner tool, and next time would be less than half that.   There's a series of pictures on the French Cardisiac forum, here, with a French text that is pretty inaccurate.