For once regenerating doesn't feel like dying. It feels welcoming, warm, nice. He remembers his last one, his whole being had wanted to stay, refused to let go. Now he feels content and calm. This is not the end but merely a new beginning.
The Doctor tries to stay calm throughout the process. He feels the heat pulsate through his limbs. He watches the golden tinge radiating from his skin. He looks back at times passed, and he feels happy. A new Doctor, a twelfth Doctor, and a universe just waiting for him to reach out a hand to help.