I’ve gotten my lobes pierced several times, and while there is a pinch that may last for a short while, it doesn’t hurt too badly. In my opinion, wearing clip on earrings is just as painful or more painful than just getting your earlobes pierced, so if you’ve worn them, then you’ll have an idea. The pain doesn’t last too long though, and you honestly should be fine as long as you make sure to turn the studs, clean them everyday, etc.
At some places you can also ask them to do both lobes at the same time, which I always did, as I find it much easier. That way, it just goes quicker and less anticipation is involved.