It depends on how much detail you want to understand. You can play Steins;Gate and Robotics;Notes on their own, but they are best understood after playing Chaos;Head (personally, I played C;H after them). Chaos;Child necessarily follows Chaos;Head. For Occultic;Nine, you can read it with no prior knowledge, as far as I’ve seen. For Anonymous;Code, you need Steins;Gate at the bare minimum, and at least a decent summary of Chaos;Head’s themes. Anything more is just added references that you’ll be able to get.

Don’t feel threatened and jump in!

You should definitely have a look at this one then!

I was doing the same! I could finally play for as long as i had always wanted!