Get Familiar with the Installation Process
If you're new to the iOS beta process you'll want to take some time to familiarize yourself with the installation process. If you find it intimidating, you might want to hold off on the iOS 10.3.3 beta until you get comfortable with it all.
We've put together a quick guide that will take you through the iOS beta installation process. It'll hold your hand through all of the steps you need to take.
Run down the steps and see if you feel comfortable. If you don't, it might be worth holding off for a few days, a few weeks, or longer.
Again, most of you are probably better off waiting for the official iOS 10.3.3 update to arrive.