You don't need Tech Sights. Just shoot the course with something that has any optics or any irons. Standard 10/22 sights are harder to get adjusted, but once they are sighted in you don't have to adjust them again. Or just borrow a gun. But go, shoot, learn.
I will say that going to the Applessed website and getting your sling set up is way more important than the sights. The sling is the system.
And if you think you can get better training, I'll point out that the exact same techniques that Appleseed teaches for the cost of a pizza dinner are the techniques that Alaska Tactical teaches for $500, and Thunder Ranch teaches for $1000 (plus airfare, car rental, hotel, etc). I shot better and faster at Thunder Ranch because I had been through Appleseed.
You'll learn a lot, and you will shoot better.