Does federation have a bit of a learning curve? No doubt.
Is Lemmy buggy as heck? Absolutely.
But I don’t think that really justifies a lot of the comments I’m seeing in Reddit alternatives threads that it’s hard to figure out. The front page feed and sort options are very similar to Reddit. Searching for same-instance communities is not too difficult. Posting, commenting, and voting are all quite intuitive. What’s the problem?
You don’t need to do that if that community is already federating with your instance. If its not, it might take a little while for the federation to actually start after you make the search (based on the server infrastructure of your instance and the remaining queue). Try searching again after a bit and it should be there. These quriks should be solved as instances become more stable, and Lemmy/kbin gets further developed.