Don't Install the macOS 10.14 Beta if You Can't Handle Problems
There are macOS Mojave problems including some features being disabled in the first beta and other issues will appear as users test the new release more and more.
Some macOS Mojave problems include crashing on login, being stuck on the login screen and there are apps that aren't working on the new software yet. Some users also report not being able to connect to the App Store, and even one user reports that his mac was basically wiped clean when installing macOS Mojave.
So far we've not heard about any showstopping macOS 10.14 beta problems, but if you don't want to deal with issues it's a good idea to skip the beta until much later in the process or until the final release.