Can someone tell me more about blocking someone and all of the specifics?

So on Twitter I recently befriended aomeone and it turns out from a few dms that they’re VERY weird.

I would love to block them and just forget this whole situation ever happened but I would love for someone to explain the EXACT specifics, and what blocking them will mean besides “you can’t see their account.”

I will be referring to them as person X.

For example:

1. We have a lot of mutual followers, will I still see person X’s replies on our mutuals tweets? Or will they be hidden?

2. Person X has my notifications turned on, will that factor into anything?

3. Is there a workaround for blocking? I assume you can make a new account, but besides that.

I can’t think of a good example, but just wondering if there are other ways to get in contact or find someone’s account after blocking.

4. Finally (definitely not the best place to ask), but I’d love a little reassurance that I’m doing the right thing. I normally never block people and I feel so awful about it, but I’m very uncomfortable and this is not something I want to have a huge discussion about. I would like to just get rid of this person and move on.

If there is anything else I should know about blocking, please let me know.

Thank you so much!