Inserting a paper stack in the tray is not tricky if done patiently. However, this thing can go wrong and show errors when not done properly. Many users say their printer says out of paper when it's not actually. This can be because of the following reasons-
1. The paper might not be able to connect or sense by the feed rollers.
2. The paper tray is overloaded with bundled papers in it
3. The paper tray is not correctly inserted into the printer
4. The paper settings are wrong or mismatch in the paper setting of the printer driver and paper tray.
Displacement of paper can also cause paper jamming. Therefore, to avoid such issues do not overload the paper tray and make sure you place the paper within the margins drawn on the paper tray.