I want someone to unfollow me on Twitter, so if I block and immediately unblock this person, will it do the trick?

Yes it's easy to Block or Unblock the person .Here is guide will help you step by step http://www.techbeatus.com/unblock-someone-on-twitter-2015/

Yes, that's how it's done

Yes it will see this page for more assistance: http://www.straight.com/blogra/548341/twitter-tip-how-make-someone-unfollow-you

I don't tweet but I assume its probably the same as any other site. I think you have to block them if you don't want them to follow you unless you have your settings set to allow only your friends to follow you. I suppose you could try your method it wouldn't hurt.

Yeah, that will work. I Google’d how to get people to unfollow you on Twitter and this came up:Select the option to "Protect my Tweets" under "Security and privacy" settings. Go to the profile of your unwanted follower and block them. This will make them unfollow you. If you want, you can then unblock them (or not).

Hmm.. I think you have conflicting goals.. Why would you want someone to unfollow you but not block them?Usually, people want others to follow them but not block them, because they want more followers.So, I think there’s something missing or not being explained.