Your settings are mostly personal preference.
Adjusting your DIN settings is not a complicated procedure. It's not uncommon for ski resorts to provide public benches with screwdrivers chained to them so people can adjust their bindings on the hill. I've been adjusting my own settings since I was a child.
There's no shortage of charts, youtube videos, etc. online showing you how to set your bindings:
The settings are there to help you prevent injury. If you're a novice skier you want your skis to pop off easy so you don't break a leg, so you need lower settings. When you get more advanced, you don't want your skis popping off while you're skiing hard or fast, so you need higher settings.
If you don't know how to set your bindings, start with a low number, or find a range that matches your abilities from a chart like the one above. Each time your skis pop off while skiing within your abilities go up a number or two at a time until they stop popping off so easy. If you want to geek out and figure out what your perfect number should be, there are many resources to help you figure that out.