If you are cheap like me. Go to the public library, they probably have or can get a video tape. The best thing I ever did to help my casting [which still isn't anything to write home about] is go to the Shallow Water Fishing Expo and watch and listen to Left Kreh. That was about 30 years after I started flailing at the air.

I haven't done it but if you have access to a video camera record your casting in the yard and compare it to the instructional tape.

Relax when you are fishing, it's not really a contest, remember what you have learned about mechanics. I know when I get lazy or rushed my casting goes to pot.

Fly fishing [in my small mind] is about having a good time, forgetting the stuff that make your blood pressure rise and good mental health. It's cheaper than a shrink and more fun.