It’s not difficult at all. I believe most of the settings should stay the same through the upgrade. I’m not sure what settings you’re specifically concerned about losing, but since SU doesn’t have that many anyway, it shouldn’t be a huge loss even if you have to reset a few things. To be safe, you could save a copy of the Components and Plug-ins folders, and export your shortcut keys prior to upgrading. Then, if those things are missing, just save/reload them back to the appropriate folders.