Site re-design and change of URLs

Hello,

I’m currently working on an existing directory site with about 250 listings and I’ll completely change theme and plugin that are currently managing them.

As a result, all URLs will change, except the domain name.

I’ll be working on a temporary domain address where I’ll import all existing listings and, when done with re-design, eventually clone back to the original, currently online, site.

I would appreciate if someone can recommend the right strategy for managing redirections in that case and if there is any automated process for that with this plugin.

Should I install this plugin at both the old and new site?

Thanks in advance!

https://wordpress.org/plugins/change-permalink-helper/