If you are running a vanilla forum, there really isn't much you need to worry about. Sure you have to get use to a new admin interface, but the improved features make it worth your time. But if you are running a heavily modded forum you have more to think about. You might want to read up and see if there are new phpBB3 versions of your mods available or if you can no longer run them. The same is true for the theme you might be running. See if there is a new version available, or if you are willing to switch to a different one.
Still want to install? Ok let's get started!
