Anakin Skywalker also didn't have any special training to use his Force abilities when he was still a slave on Tatooine:
"He can see things before they happen. That's why he appears to have fast reflexes. It's a Jedi trait." -Qui-Gon Jinn
So, I have no difficulty believing Rey is capable of learning things without formal Jedi training. She also seemed pretty adept with her staff, so I also have no problems with her being able to use a lightsaber.
"He can see things before they happen. That's why he appears to have fast reflexes. It's a Jedi trait." -Qui-Gon Jinn
So, I have no difficulty believing Rey is capable of learning things without formal Jedi training. She also seemed pretty adept with her staff, so I also have no problems with her being able to use a lightsaber.