I have plenty of them where I live.
Repeated exposure perhaps, a bit at a time,
then gradually build up.

I'd say start with wasp posters in your bedroom :)

btw, yes, it SUCKS to get stung.
Whenever I need to trim bushes I always whack
them a few times with a long pole.
Sometimes clouds of them emerge.

the weird part of it is im terrified of only certain kinds of them mostly the yellow jackets, paper wasps, guinea wasps, and my LEAST favorite that ill leave the premises if I see the feared vicious mahogany red wasp. Surprisingly for some really odd reason im not even bothered by hornets, theyre actually quite calm and timid and ive let one crawl on my foot before. but I don't mind hornets, mud/mason wasps, and the beautiful cuckoo wasp which shines a bright iridescent blue green metallic color.

and yes it suck to get stung I have stepped on an underground yellow jacket nest before o.o

Yeah that's understandable it's like if I see em, for example yesterday I had to go turn on the irrigation motor and there's this one that's about the size of a baseball...I'm like super cautious when I get near it but I know there there and I can see them so in a sense I'm a little bit at ease, but it's when we go messing with old equipment that hasn't been touched for a couple months and you just happen to bump up against the side of said equipment and they start pouring out of an orifice on there I just can't..even..just ugghhhhhh like I feel like I'm literally gonna throw up when that happens. I don't really know how much more I can submerge myself in dealing with them if I already deal with them every day ;^;