Typically moves from confusion/panic to a sense of "new reality" or acceptance.
Here is a short story written in the spirit of a classic SapphireFoxx "transformation" sequence:
He tried to pull away, but his hand felt heavy, almost liquid. He watched in a mix of terror and fascination as his fingers tapered, his knuckles smoothing out into delicate, pale points. The transformation climbed his arm like a slow-moving tide. His flannel sleeve suddenly felt cavernous, the heavy wool becoming a burden as his shoulders narrowed and sloped.