CBT with exposure therapy. They’ll probably just start by getting you to look at pictures of spiders, and then get you used to being in the same room as one etc etc until you can hold one.
I’m a little bit scared of spiders. Especially large ones. I have been to Australia a few times, and I personally think snakes are actually worse than spiders… especially the snakes that just leave behind their skin, so you know they’ve been there… but you can’t find the actual snake.