There's a learning curve, but usually the community name is enough and then most clients will be able to suggest the instance.
Protip, read the sidebars! There's often some links to other relevant communities, allowing you to hop from community to community to get around and explore without a recent post needing to randomly show up in your feed.
If you're unfamiliar, you can cross-post your posts to multiple communities.
Once you make the first post, you can use the cross-post feature to make additional posts in other suitable communities. They will link together so people can see all the comments, and lemmy will be able to tell it's the "same" post and not show it many times in peoples feeds.
Also don't hesitate to actually link your other socials. I've been linking the fediverse accounts, patreons and ko-fis of artists who have them whenever I share their art.
We want you to be getting as much as there is to get from sharing your work here.
GoComics gave me a hard time for a bit with constant breaking changes every few days. But it's been stable for a while now.
That said, I want to point out that while posts on the fediverse are decentralized, images are not.
Instances can re-host post media, but it's only a temporarily cached thumbnail, or temporary proxied image. Instances do not re-host every piece of media on the fediverse, rather, while the post metadata is duplicated, the media url in the post, even as it federates to other instaces, always points to the original posters home instances image-rs server. Which is where every person opening the post url will load it from.
A DMCA takedown request would absolutely be enforcable.
I can see why you see it.
But I really didn't and still don't read it that way.