My girlfriend disagrees and thinks a woman can disarm a man with the right skills.
I can.
Took a one-day class based on the Lindell disarms & retentions shortly after I first learned to shoot. I had my doubts at the time, but worked to learn the material. It wasn't natural for me; I am a klutz by nature and it just seemed very confusing and complicated at first. But people I trusted said that it would work, so I worked hard to learn it.
One day of training.
The friend who took the class with me worked with me a couple times over the next few months (the blind leading the blind - he'd had only that one-day class too). Then we took the free retake of the one-day class the following year (it was actually about 8 months later). To my shock, I remembered all of the skills and could use them on demand. Hmmm.
We kept practicing. Eventually I took a one-day advanced disarms/retention class which included Code Eagle guns. Since nearly everyone in the class was male, I did successfully take a gun away from a resisting male without getting shot. In fact, only one student in that class got shot, and he had noticeably telegraphed what he was about to do.
The Lindell techniques are based on leverage,
not on strength or muscle power. While there are specific techniques for each type of attack, the underlying principle for all techniques is the same. Once you understand this governing principle, the techniques become
very simple and intuitive -- allowing you to flow from one "technique" into another without much conscious thought. Until you understand the underlying principle, it's a confusing mess of separate, discrete "steps" that can easily be confused and befuddled.
Bottom line?
Yep, a single class is indeed enough for a woman to learn how to successfully take a gun away from a resisting male.
However, it requires practice after the event or your money is wasted. And how much value you will get out of such a class depends upon your commitment to really understand what you are doing and why, and to practice afterward.
Would I try to grab a gun away from an attacker? That depends on the circumstance; it is very risky even when you know what you are doing. But I know in my guts that I am physically capable of getting the gun away if I need to and have no other viable choice.
pax
Edited to add: I would trust absolutely
NO strength-based techniques, including Tae Kwon Do or any other "hard" style of martial arts, for this kind of thing. Hard styles are notsomuch for those at a size/weight/strength disadvantage. If the disarms class is based on strikes or blows, look elsewhere.