I haven't ever had a seriously deep cut or anything to work from to begin imagining what it feels like.
I've googled variations on "deep cut experience" "deep wounds how it feels" "slit throat experience" (I wasnt hopeful for a first person account, there)
I've looked into the anatomy of the throat thinking that I could work from knowing what happens but have no idea which parts would actually be cut.
The weapon is something similar to a straight or "cut throat" razor. Would that cut the trachea or just the big juicy veins?
Thanks for any insight you can give me.
EDIT: The attacker is behind the victim. Her head is tilted back somewhat and she is suspended in midair by her attacker's other hand.