I think one of the biggest questions one must ask before trying to deal with arachnophobia is "approximately what geographic region do you live?"
I say this because how you calm somebody in, say, Europe, tends to be significantly different from how you calm somebody in North America different from South America different from Australia.
If you're in a region that has no native dangerous (to human) spiders? A good way to start is to point out exactly that, and try to find any sort of arthropods they do like because it gives you a point for trying to address the more conscious parts of the phobia. Addressing unconscious aspects of a phobia is something that often need be tackled at one's own pace regardless of where they live (be it trying to form a tolerance to the presence of as much, changes in one's mindset / philosophy, or so-on), but "The worst the can do you is give you an uncomfortable bite" + "They share this trait with arthropod you like" tend to be good starts for conscious phobia addressing.
Since you can't really do that in areas that do have particularly venomous spiders, you're better addressing the likelihood / identification of as much (ideally without images, since again you're dealing with a phobia) instead. One of the big things that helped me was learning that there's only three dangerous spider species where I live, one of which is only if you have an allergic reaction (one of the two native ones), one of which is extremely distinct and identifiable (as well as typically lives in places of low human activity + high amounts of undeveloped nature), and the third is almost exclusively encountered individually as an import accidentally transported via goods moving from further south. With that conscious level of "They can't hurt me in any way that matters" I was able to suppress some of the more unconscious aspects at my own pace.
Which itself obviously doesn't work in places with large numbers of dangerous species.
May seem a bit daft going on about this when talking about wanting reasons to like spiders, but believe me getting your fight-flight under control is probably the biggest first step when it comes to broadening your perception in general. More likely to consider any fun facts, watch them from the safety of the opposite side of a pane of glass, pay attention to differences in webs, and what-have-you when your body isn't screaming "Nope! Don't want no part of this!" the whole way.