I took two (2) courses in Advanced Pistol from Shawn W (the poster, just up above).
The second course had a segment in self-defense against knives.
That segment alone was fully worth the entire price of both courses. It is still stuck in my head, although I hope never, ever to have to use it. Knife attacks are really ugly.
If Shawn (a) is teaching the 88Tactical course or (b) highly recommends another person who is teaching the knife defense course, then...........
My recommendation to you would be to sign up for it.
FWIW,