There are! Dozens of them on YouTube, I reviewed a few before starting, just started with a "Replace AC filter Tesla Model 3" search.
It's really very easy, the worst part is sort of standing on your head
It's two plastic panels and one screw.
If you want a little assistance with push pins, trim panels, etc., I'd highly recommend something like this, super handy, only $10:
Dealing with Interior panels is always a little cringy, you have to exert a decent amount of force, but then it feels like you're breaking something, but the videos will give you some confidence how thing come apart.
Oh, FWIW, because I wanted them sooner-than-possible, I went with some aftermarket filters:
$22.99 minus 5% (at the moment), delivery in a day or two. Comparing them to the OEM part, they seemed nearly identical.