1. As mentioned in CD Projekt Red's response to the FPP/TPP debate, you will have plenty of opportunities to see your character. To be able to see themselves in the mirror, the player's body would have to be already rendered in-game. Viewing what the player does in TPP will thus require only changing the camera angle, not adding more animations or movements.
False. TONS of game engines use separate animation sets for third person and first person. CSGO, for instance, uses arms and guns placed in front of a camera for animations in the FPP, while TPP models are animated separately. Bethesda's engine is the same.