I tried for over a month last summer to get into an NRA instructors class and couldn't find one that took less than several weeks, and there were no classes available cause they didn't want to teach less than 6 people, and didn't have enough interest. If you don't mind driving north a bit, Bullseye and I can meet you and show you what we know. Neither one of us are "experts, but we are competent. I live near Marion Indiana. Bulls eye and I have shot together before, and we'd enjoy a get together.
I'm not a bit impressed with Dons Guns, but I know nothing about PopGuns. I wouldn't hesitate a bit to ask them to furnish you with some references form prior students.
"For those who fought for it, freedom has a flavor the protected cannot taste."
"USMC 8652, 2531, RVN Jun '67, - May 69"