For me, flintknapping is a cross between any skill requiring hand-eye coordination and an art form.
The closest thing I can relate it to is shooting pool...when I was single, I played at least six nights a week, at least an hour or two (usually more) a night, for several years. I got to a level where I could read the table, read the angles, plan the leave and several shots in advance, and I had confidence in my ability to make a shot. Fast forward, I'm married, I shoot pool maybe twice a year and it's embarassing and frustrating. No eye for the angles, no touch, no muscle memory, no confidence.
Flintknapping is the same - you've got to do it often enough to be able to read the stone, see the angles, plan several steps in advance and strike with confidence. That said, like drawing or painting, it just seems to come more naturally to some folks than others... I'm not one of them. You need to have access to A LOT of rock to get good at it. To be
really good, you need that inner artist gift thing.
To get by in a survival situation, it wouldn't take much at all. Knowing what kind of rock to look for is most important - in the midwestern U.S., most creeks and rivers will have chert or quartzite cobbles - they ring or ping like glass when you tap them with another rock, rather than clunk or thud. You can make very useable choppers and flake knives with very little skill at all, with no other tools than what you find at your feet. I thought Taurus' ammo box knife was pretty cool, but given a choice (and depending on the situation), I'd personally be able to make cutting tools much faster and easier out of stone. As the saying goes, YMMV.
I don't remember exactly where you're from, but nearly every part of the country has some stone you can use. Obsidian is fun to work with, but I never thought it was very forgiving - I always like playing with quartzites best.
Use Goodsearch and look for 'knap in' for you state or region - what you spend on tuition for a class might be better spent on gas driving to a knap in. You'll meet folks with a wide range of skills and a variety of stone and tools, often times for sale or trade (especially if you have access to hides, sinew or antler).
Unless they are serious, commercial knappers, most knappers I've ever met are more than willing to give you tips, talk you through a crude biface, etc...
The best general text I've seen (disclaimer: don't know him/no financial interest, etc...) is called
The Art of Flintkapping by D.C. Waldorf, his web site is
here A few readings of that gave me more insight that many hours of randomly breaking rock. Bruce Bradley has a video that is pretty good at explaining the theory and thought process involved in working the stone. He's both an archeologist and a flintknapper and really understands the change in knapping technology over time and space, if you're into that kind of thing... He's also one of the best knappers in modern times. Disclaimer - he's worked with our lab in the past and teaches at a university in England we have an exchange program with.
Anyway, didn't realize I'd rambled this much. Knapping is theoretically very easy, controllable and predictable; in practice it really p*sses me off. In a good way... Hope you have better experiences with it in the future than your first class. BTW, who taught your class and where? What was the instructor's background? Just curious.