If you want to test it "before launch", USE AN EXTERNAL DRIVE as your "test bed".
I wouldn't trust ANY beta version to become my "main OS" on my primary drive.
Actually, I'd always experiment with an external test drive first, ANY TIME before doing a major OS upgrade.
If you find you don't like things, or that things don't work properly, then it's easy to "get back, get back, get back to where you once belonged".
Just DISCONNECT "the test" drive!