No rush, take your time. HA OS was pretty simple to get running, you'll just have to learn how to pass through your usb (top tip, just have that one usb plugged in then you only have 1 device to choose from).
Learn how to make a backup (HA has an add-on called Google Drive Backup that's REALLY useful) just in case you tinker and kill something.
Above all, don't kick yourself for making mistakes, it's how we learn.