get two magic markers and a friend and have a "knife fight" with them then go look in the mirror
If you are interested is close combat and knife fighting can't go wrong with Col. Rex Applegate's book https://www.amazon.com/Kill-Get-Killed-Rex-Applegate/dp/1581605587
and this the Fairbairn manual of Knife Fighting https://archive.org/stream/TheFairbairnManualOfKnifeFighting/The%20Fairbairn%20Manual%20of%20Knife%20Fighting#p age/n3/mode/2up
if you consider using a knife for self defense consider getting a purpose built purposed designed knife I have a Applegate Fairbairn copy made by Boker .. I think it makes a difference
some online video's three parter it's so so worth a watch
these guys are real good https://www.youtube.com/user/StaySafeMedia/videos?sort=dd&view=0&shelf_id=1
This is important you have to know where to attack http://www.medicalcity-iq.net/medlib/Anatomy%20of%20the%20Human%20Body.pdf
study up on where arteries and tendons and vital organs are
how to pick a knife what knives are made of http://zknives.com/knives/articles/knifesteelfaq.shtml
Simple fact of life for women.. you probably won't know you are being attacked until you are already hands on and in body contact very little warning. Men too, if I was going to attack somebody, especially a possibly armed somebody I would want to start with an attack at very close range that could disable an arm or leg or pin it and where I could dominate with hyperviolence to put the mind in a brainfreeze with shock, the bad guys know this . I have already posted some of the best information of how to cope with intense interpersonal violence with the Grossman stuff / bullet proof mind that all applies here.
knowing and practicing some hand to hand and knife skills could be important but again training and practice is important .. in a crunch it comes down to muscle memory and clarity of thought and intent .Having some skill and knowing key places to slash or stab and which is which is a heck of an advantage in a fight.
J.R.R. Tolkien "I do not love the bright sword for its sharpness, nor the arrow for its swiftness, ... I love only that which they defend.