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How do I change my cabin air filter?
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Unfortunately, cabin air filters are not like engine air cleaner filters. They tend to be quite a lot harder to get at, especially the first time.

Most (if not all) Honda cabin filters are behind the glove box, and require removal of the glove box for access. If you're not too handy with tools and small, fiddly parts, then you're probably better off to get someone to do this for you.

Cabin air filters are readily available from aftermarket suppliers. Most of those come with a sheet of paper outlining the replacement procedure. Those instructions are of variable quality, and may or may not be more confusing than enlightening.

Purolator used to have pretty good sets of instructions, but Purolator's filter division was purchased by Bosch in 2006, so Bosch has taken over the Purolator instruction database and has enhanced it.
You may find that list here:
http://www.boschautoparts.com/
Choose Filters from the menu at left, then Cabin Filters from the page that comes up, then Technical Resources from the menu at right. On the page that comes up after that, choose CabinAirFilterInstallation.pdf

Some cars, like the '98 Accord, have TWO cabin filters, making the process even more complex. This site has a good tutorial on replacement for that vehicle:
http://www.troublecodes.net/articles/cabinair.shtml
These steps are close enough to those in other cars that you can take them as a general overview of what the process is like.

By the way, if you're thinking the filter is a major pain to replace and would like to get rid of it completely, that may not be a good idea. Those filters are good for reducing the system's propensity to smell like dirty socks with age. These filters cut down dramatically on the amount of dust, dirt, leaves and other detritus that will stick to the evaporator's core and absorb moisture, which leads to fungal growth and bad smells.