Get your Green working well and updated before you start adding integrations and devices. Take a backup snapshot you can rollback to, and then start adding things.
You’re starting off at the deep end since that integration requires HACS to be installed. Good Luck!
Follow @IOT7712’s advice and spend a couple of days getting familiar with HA (including backups downloaded to your PC or anywhere off the Green) before starting with HACS & custom integrations.
Set it up to get your backup off box automatically and copy your encryption keys. If yih have that you can undo anything you can do with a keyboard. Then IMMEDIATELY back up and restore your box before you put anything on it. Congrats you just did a disaster exercise. Keep doing that quarterly.
Backups can’t fix it if you get frustrated and take a sledgehammer to it but they sure save your bacon by letting you restore a good config to anything that runs ha.
The single biggest thing people mess up is not knowing backup exists.
It’s in the backup settings (scroll to the bottom) look in the backup locations, there should be a config gear icon where you can go in and turn on/off encryption per destination.
You will not be able to turn off the toggle for Nabu Casa as they dot store unencrypted backups