I've always found the shop manuals for the Honda outdoor equipment I have to be very detailed. If you have the official manual for that machine, I'd say you can trust what it says and follow it. So far as removing the mower deck compared to the snow blower, I would guess the deck would be in the way of getting to the belt, but if the snow blower frame isn't in the way of getting the job done then you might be lucky enough to not have to take it off and put it on again.