Be Ready to Downgrade
If you run into bugs or performance issues on iOS 13.3 you can try downgrading to a previous version of iOS 13.
Once Apple releases iOS 13.3 you'll have the option to downgrade to older firmware. Apple's closed off the downgrade path back to iOS 12, but you'll be able to downgrade to an older version of iOS 13.
If you aren't familiar with the iOS downgrade process, it's a great time to get familiar with it.
Once iOS 13.3 arrives, the downgrade will only be open for a short time so it's important to get familiar with the process ahead of time. This way you aren't scrambling.