If you're keen to try the beta, but aren't sure how, download & run it just like any other copy of NVDA!
You can install it, but we recommend most users create a portable copy. Tips here: https://www.nvaccess.org/post/in-process-9th-february-2024/#portable
Particularly test any highlighted features or those mentioned in the change log.
GitHub is the best place to report issues - steps here: https://www.nvaccess.org/post/in-process-17-july-2025/#issues
Or ask here or via email!
What other tips would experienced users give new testers?