I don't think literary fiction is any easier than genre. A good story is a good story. And I don't think saying literary fiction is easier because it allows more freedom is true. For someone who doesn't read and write literary fiction, it is not going to make novel writing easier. And if the OP does write literary fiction, it doesn't mean it will be easier for him to write novels.
That being said, novels require a much bigger commitment than a short story. That seems to be my problem in switching over. I have a lot of fun with short stories. A novel requires a lot more work. But plenty of people do both. I wouldn't give up the short-story writing if that's where you shine.
I agree with this.
Also, I made a lot of mistakes on my first novel. Kind of a throw me in the deep end of the pool and see if I swim situation. Sometimes, you just need to feel around for things to unlock.