Hi,
Any suggestion as to how I might go about this without a development area?
If you can’t have a staging site, atleast make sure you make a backup of the site prior to making changes using Elementor so you have something to go back to incase of any “huge mess”. 😀
As for actual incorporation of Elementor to an existing WordPress site:
Elementor is known to work with GeneratePress. We have site template that already use Elementor for its contents which you can check here: https://generatepress.com/site-library/
As for using Elementor, you should be able to edit pages with Elementor but pre-existing contents added to the page prior to using may have issues. You most likely will not be able to edit these within Elementor’s UI.
For any issues that may come up w/ contents created with Elementor, its best to ask their support about it. 🙂