I think that's why, when twitter first got shitty and everyone said to go to Mastodon, not that many people (relatively) did. Because, no one knew how to explain it in a way for non techy people to understand or want to deal with.

I also think it's much easier to explain now, tell them to go to https://join-lemmy.org/ and pick a server. "which one?" Doesn't matter, click one, read the sidebar, If you agree with what they said then sign up, if not pick another one. (Or just tell them to pick the one you signed up for already) That's your lemmy site now and you can see all the content from the all the other lemmy sites from yours unless it's blocked.

Same thing for Mastodon https://joinmastodon.org/servers