Yes going from flying LOS to FPV is definitely a transition, the brain need to create new pathways. But it's just a matter of practice - once it "clicks", you've got it.
Once you get the hang of it I would say FPV is actually easier than LOS, since you don't have to adapt to seeing the aircraft from different orientations and distances. You're always in the pilot seat.
The difference in view you get from altering the camera angle changes the feel of yaw and roll cross-coordination. A high camera angle might make it feel a bit counter intuitive at first. (From the camera view, it feels like yaw and roll starts to switch places the more you raise the camera angle). But again, it's just a matter of practice.
Personally, I use 30 degree camera angel and 70 degree field of view for both freestyle and racing.