Re: what changes first and what changes last
First: The "subtle" things. Small, barely visible hairs/fur/Scales/whatever or pointy ears, wider nose... depends on the type of TF but basically the things the "victim" does not notice right away or that even when noticed it can ignore or hide.
Last: Again depends of the theme of the TF but I'd go with the mind, when the human thought becomes entirely replaced by that of the new species. Or, in the case of no mind changes taking place, I'd go with the already mentioned face/head change.
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