Why you are insisting that learning the force must be difficult is beyond me. That isn’t what we see with Luke. Why should we with Rey? For both characters, there are plenty of obstacles and successes and focusing on Luke’s obstacles while focusing on Rey’s successes is most definitely apples and oranges. Compare their successes (their goals and what they actually achieve) and their failures and both follow the same pattern - some wins, some losses, but generally more wins.
Because Lucas has made this very clear in his statements about how the Force works, which I’m not going to repeat. You have to study, to master it. It’s as simple as that. The entire premise of TESB is, that the Force doesn’t come easy for Luke, and he fails on numerous occasions, and where he succeeds, he rarely succeeds on a first try. Luke leaves Yoda with the clear message, that while he knows the Force, he cannot control it, and facing Vader in this condition is a danger to him physically, and spiritually. He subsequently gets his *** handed to him in his confrontation with Vader, and he ends up hanging on for his life battered hoping that his friends will save him. You don’t have to look hard to see, that Rey’s character gets a very different treatment in the ST. The OT and PT make it very clear, that learning the Force, and becoming a Jedi is very difficult, and just using it half cocked has terrible consequences.
I don’t think it is that different compared to the Force. Luke has always dreamed of the future. His mind was never on where he was or what he was doing. In Rey we have the opposite. Her mind was nearly always on where she was and what she was doing. She had to in order to survive. Everything about the two characters is opposite in terms of training for the Force. Rey has very much had the Miagi type training in life that prepared her to be a Jedi. She has the focus. She also heard the stories so when she sees Kylo do these things, she believes and knows they can be done. So Rey has none of Luke’s doubt - the thing that made him learning the force more difficult. Yet even so, he had no problem learning to deflect a blaster bolt (a full Jedi learns how to aim that as we saw in the PT), he is able to aim the proton torpedoes to destroy the Death Star. Out of desperation he picks up his lightsaber the first time he tries (it takes him a moment to focus and get it right). His training with Yoda was good enough that he can hold his own against Vader. Nothing about how he learned his force skills is hard except his belief and focus. What we do see is that practice, control, and great skill in using these powers takes practice. But learning them and using them comes easy.
What RogueLeader was talking about with being ‘in the zone’ takes years of practice, but once you learn how to do that with one thing you can apply it to something else. We do that with typing, driving, and a lot of things that we just don’t think about. It is learning to apply that to something new that is challenging and difficult. Lucas is right that becoming a Jedi takes a long time, but he has never said the skills needed are hard to learn. We see Rey pick them up from Kylo and then she seeks out Luke to help her channel these new powers. When that fails, she takes the books, hoping they have the answer. She knows she is not ready and needs training. We see her seek that out. The force awakened in her and she wants help understanding what happened and learning how to use it. There is a lot to being a Jedi besides just lifting rocks.
There’s a lot more to becoming a Jedi, and her development doesn’t reflect that either. Remember Obi-Wan’s line:
“This is a dangerous time for you, when you will be tempted by the Dark Side of the Force.”
This was after Luke recieved training. The entire saga up till the ST revolved around the idea of temptation, and control. Here again it comes easy for Rey, who is never tempted. So, as I stated, she gets her powers for free instantly without the temptation, that every Jedi had to face before her.